NCERT Solutions  Class 11 Maths Chapter 10  Straight lines
CBSE Solutions  Maths Class 11
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NCERT  Class 11 Maths
Book:  National Council of Educational Research and Training (NCERT) 

Board:  Central Board of Secondary Education (CBSE) 
Class:  11th 
Subject:  Maths 
Chapter:  10 
Chapters Name:  Straight lines 
Medium:  English 
Straight lines  Class 11 Maths  NCERT Books Solutions
NCERT Solutions for Class 11 Maths Chapter 10 Straight Lines Ex 10.1
Ex 10.1 Class 11 Maths Question 1.
Draw a quadrilateral in the Cartesian plane, whose vertices are ( 4, 5), (0, 7), (5, 5) and (4, 2). Also, find its area.
Solution.
The figure of quadrilateral whose vertices are A( 4, 5), B(0, 7), C(5, 5) and D(4, 2) is shown in the below figure.
Ex 10.1 Class 11 Maths Question 2.
The base of an equilateral triangle with side 2a lies along theyaxis such that the midpoint of the base is at the origin. Find vertices of the triangle.
Solution.
Since base of an equilateral triangle lies along yaxis.
Ex 10.1 Class 11 Maths Question 3.
Find the distance between P(x_{1} y_{1}) and Q(x_{2}, y_{2}) when :
(i) PQ is parallel to the yaxis,
(ii) PQ is parallel to the xaxis.
Solution.
We are given that coordinates of P is (x_{1}, y_{1}) and Q is (x_{2}, y_{1}).
Distance between the points P(x_{1}, y_{1}) and Q(x_{2}, y_{1}) is
Ex 10.1 Class 11 Maths Question 4.
Find a point on the xaxis, which is equidistant from the points (7, 6) and (3, 4).
Solution.
Let the point be P(x, y). Since it lies on the xaxis ∴ y = 0 i.e., required point be (x, 0).
Since the required point is equidistant from points A(7, 6) and B(3, 4) ⇒ PA = PB
Ex 10.1 Class 11 Maths Question 5.
Find the slope of a line, which passes through the origin and the midpoint of the line segment joining the points P(0, 4) and B(8,0).
Solution.
We are given that P(0, 4) and B(8, 0).
Let A be the midpoint of PB, then
Ex 10.1 Class 11 Maths Question 6.
Without using the Pythagoras theorem, show that the points (4, 4), (3, 5) and (1, 1) are the vertices of a right angled triangle.
Solution.
Let A(4, 4), B(3, 5) and C(1, 1) be the vertices of ∆ABC.
Let m_{1} and m_{2} be the slopes of AB and AC respectively.
Ex 10.1 Class 11 Maths Question 7.
Find the slope of the line, which makes an angle of 30° with the positive direction of yaxis measured anticlockwise.
Solution.
The given line makes an angle of 90° + 30° = 120° with the positive direction of xaxis.
Hence, m = tan 120° = – \(\sqrt { 3 } \).
Ex 10.1 Class 11 Maths Question 8.
Find the value of x for which the points (x, 1), (2, 1) and (4,5) are collinear.
Solution.
Let A(x, 1), B(2, 1) and C(4, 5) be the given collinear points. Then by collinearity of A, B, C, we have slope of AB = slope of BC
Ex 10.1 Class 11 Maths Question 9.
Without using distance formula, show that points (2, 1), (4, 0), (3, 3) and (3, 2) are the vertices of a parallelogram.
Solution.
Let A(2, 1), B(4, 0), C(3, 3) and D(3, 2) be the vertices of the given quadrilateral ABCD. Then,
Ex 10.1 Class 11 Maths Question 10.
Find the angle between the xaxis and the line joining the points (3, 1) and (4, 2).
Solution.
We are given that the points are A(3, 1) and B(4, 2)
Ex 10.1 Class 11 Maths Question 11.
The slope of a line is double of the slope of another line. If tangent of the angle between them is \(\frac { 1 }{ 3 } \), find the slopes of the lines.
Solution.
Let m_{1} and m_{2} be the slopes of two lines.
Ex 10.1 Class 11 Maths Question 12.
A line passes through (x_{1}, y_{2}) and (h, k). If slope of the line is m, show that k – y_{1} = m (h – x_{1}).
Solution.
A line passes through (x_{1}, y_{1}) and (h, k). Also, the slope of the line is m.
Ex 10.1 Class 11 Maths Question 13.
If three points (h, 0), (a, b) and (0, k) lie on a line, show that \(\frac { a }{ h } +\frac { b }{ k } =1\)
Solution.
Let A(h, 0), B(o, b) and C(0, k) be the given collinear points.
∴ Slope of AB = Slope of BC
Ex 10.1 Class 11 Maths Question 14.
Consider the following population and year graph, find the slope of the line AB and using it, find what will be the population in the year 2010?
Solution:
Slope of AB + \(\frac { 9792 }{ 19951985 } =\frac { 1 }{ 2 } \)
Let the population in year 2010 is y, and coordinate of C is (2010, y) then, slope of AB = slope of BC
NCERT Solutions for Class 11 Maths Chapter 10 Straight Lines Ex 10.2
In Exercises 1 to 8, find the equation of the line which satisfy the given conditions:
Ex 10.2 Class 11 Maths Question 1.
Write the equations for the xand yaxes.
Solution.
We know that the ordinate of each point on the xaxis is 0.
If P(x, y) is any point on the xaxis, then y = 0.
∴ Equation of xaxis is y = 0.
Also, we know that the abscissa of each point on the yaxis is 0. If P(x, y) is any point on the yaxis, then x = 0.
∴ Equation of yaxis is x = 0.
Ex 10.2 Class 11 Maths Question 2.
Passing through the point (4,3) with slope \(\frac { 1 }{ 2 } \).
Solution.
We know that the equation of a line with slope m and passing through the point (x_{0}, y_{0}) is given by (y – y_{0}) = m (x – x_{0}).
Ex 10.2 Class 11 Maths Question 3.
Passing through (0, 0) with slope m.
Solution.
We know that the equation of a line with slope m and passing through the point (x_{0}, y_{0}) is given by (y – y_{0}) = m(x – x_{0})
Here, slope = m, x_{0} = 0, y_{0} = 0 Required equation is (y – 0) = m(x – 0)
⇒ y = mx.
Ex 10.2 Class 11 Maths Question 4.
Passing through (2,2^3) and inclined with the xaxis at an angle of 75°.
Solution.
We know that the equation of a line with slope m and passing through the point (X_{0}, y_{0}) is given by (y – y_{0}) = m(x – x_{0})
Ex 10.2 Class 11 Maths Question 5.
Intersecting the xaxis at a distance of 3 units to the left of origin with slope 2.
Solution.
We know that the equation of a line with slope m and passing through the point
(x_{0}, y_{0}) is given by (y – y_{0}) = m(x – x_{0}).
Here, m = – 2, x_{0} = – 3, y_{0} = 0
y0 = 2(x + 3) ⇒ 2x + y + 6 = 0
Ex 10.2 Class 11 Maths Question 6.
Intersecting the yaxis at a distance of 2 units above the origin and making an angle of 30° with positive direction of the xaxis.
Solution.
We know that the equation of line with slope m and passing through the point (x_{0}, y_{0}) is given by (y – y_{0}) = m(x – x_{0})
Ex 10.2 Class 11 Maths Question 7.
Passing through the points (1,1) and (2, 4).
Solution.
Let the given points be A(1, 1) and B(2, 4).
We know that the equation of a line passing through the given points (xx, y,) and (x2, y2) is given by
Ex 10.2 Class 11 Maths Question 8.
Perpendicular distance from the origin is 5 units and the angle made by the perpendicular with the positive xaxis is 30°.
Solution.
Here, we are given that p = 5 and ⍵ = 30°.
Ex 10.2 Class 11 Maths Question 9.
The vertices of ∆PQR are P(2, 1), Q(2, 3) and ff(4, 5). Find equation of the median through the vertex R.
Solution.
The vertices of ∆PQR are P( 2, 1), Q(2, 3) and R(4, 5).
Let S be the midpoint of PQ.
Ex 10.2 Class 11 Maths Question 10.
Find the equation of the line passing through (3, 5) and perpendicular to the line through the points (2,5) and (3,6).
Solution.
Let M(2, 5) and N(3, 6) be the end points of the given line segment.
Ex 10.2 Class 11 Maths Question 11.
A line perpendicular to the line segment joining the points (1, 0) and (2, 3) divides it in the ratio 1: n. Find the equation of the line.
Solution.
Let A(1, 0) and B( 2, 3) be the given points and D divides the line segment in the ratio 1 : n.
Ex 10.2 Class 11 Maths Question 12.
Find the equation of a line that cuts off equal intercepts on the coordinate axes and passes through the point (2,3).
Solution.
Let the required line make intercepts a on the xaxis and yaxis.
Then its equation is \(\frac { x }{ a } +\frac { y }{ b } =1\)
⇒ x + y = a … (i)
Since (i) passes through the point (2, 3), we have
2 + 3 = a ⇒ a = 5
So, required equation of the line is
\(\frac { x }{ 5 } +\frac { y }{ 5 } =1\) ⇒ x + y = 5.
Ex 10.2 Class 11 Maths Question 13.
Find equation of the line passing through the point (2, 2) and cutting off intercepts on the axes whose sum is 9.
Solution.
Let the intercepts made by the line on the xaxis and yaxis be o and 9 – a respectively.
Then its equation is
\(\frac { x }{ a } +\frac { y }{ 9a } =1\)
Since it passes through point (2, 2), we have \(\frac { 2 }{ a } +\frac { 2 }{ 9a } =1\)
⇒ 2(9 – a) + 2a = a(9 – a)
⇒ 18 – 2a + 2a = 9a – 9a^{2}
⇒ 18 = 9a – a^{2} v a^{2} – 9a + 18 = 0
⇒ a^{2} – 6a – 3a + 18 = 0
⇒ a(a – 6) – 3 (a – 6) = 0 ⇒ a = 3, 6
Now, if a = 3 ⇒ b = 9 – 3 = 6 and if a = 6 ⇒ b = 9 – 6 = 3
So, required equation is
\(\frac { x }{ 3 } +\frac { y }{ 6 } =1\quad or\quad \frac { x }{ 6 } +\frac { y }{ 3 } =1\)
i.e., 2x + y – 6 = 0 or x + 2y – 6 = 0.
Ex 10.2 Class 11 Maths Question 14.
Find equation of the line through the point (0, 2) making an angle \(\frac { 2\pi }{ 3 } \) with the positive xaxis. Also, find the equation of the line parallel to it and crossing the yaxis at a distance of 2 units below the origin.
Solution.
Here, m = tan \(\frac { 2\pi }{ 3 } \) = \(\sqrt { 3 } \)
The equation of the line passing through point (0, 2) is y 2 = \(\sqrt { 3 } \)(x – 0)
⇒ \(\sqrt { 3 } x\) + y – 2 = 0
The slope of line parallel to
\(\sqrt { 3 } x\) + y – 2 = 0 is \(\sqrt { 3 } \).
Since, it passes through (0, 2).
So, the equation of line is
y + 2= \(\sqrt { 3 } \)(x – 0)
⇒ \(\sqrt { 3 } x\) + y + 2 = 0.
Ex 10.2 Class 11 Maths Question 15.
The perpendicular from the origin to a line meets it at the point (2, 9), find the equation of the line.
Solution.
Ex 10.2 Class 11 Maths Question 16.
The length L (in centimetre) of a copper rod is a linear function of its Celsius temperature C. In an experiment, if L = 124.942 when C = 20 and L = 125.134 when C = 110, express L in terms C.
Solution.
Assuming L along xaxis and C along yaxis, we have two points (124.942, 20) and (125.134, 110). By two point form, the point (L, C) satisfies the equation
Ex 10.2 Class 11 Maths Question 17.
The owner of a milk store finds that, he can sell 980 litres of milk each week at Rs. 14/litre and 1220 litres of milk each week at Rs. 16/litre. Assuming a linear relationship between selling price and demand, how many litres could he sell weekly at Rs. 17/litre?
Solution.
Assuming L (litres) along xaxis and R(rupees) along yaxis, we have two points (980,14) and (1220,16).
By two point form, the point (L, R) satisfies the equation.
Ex 10.2 Class 11 Maths Question 18.
P(a, b) is the midpoint of a lone segment between axes. Show that equation of the line is \(\frac { x }{ a } +\frac { y }{ b } =2\).
Solution.
Let the line AB makes intercepts c and d on the xaxis and yaxis respectively.
Ex 10.2 Class 11 Maths Question 19.
Point R(h, k) divides a line segment between the axes in the ratio 1:2. Find equation of the line.
Solution.
Let AB be the given line segment making intercepts a and b on the xaxis & yaxis respectively.
Then, the equation of line AB is \(\frac { x }{ a } +\frac { y }{ b } =2\)
So, these points are A(a, 0) and B(0, b).
Now, R(h,k) divides the line segment Ab in the ratio 1 : 2.
Ex 10.2 Class 11 Maths Question 20.
By using the concept of equation of a line, prove that the three points (3, 0), ( 2, – 2) and (8, 2) are collinear.
Solution.
Let the given points be A(3, 0), B(2, 2) and C(8, 2). Then the equation of the line passing through A and B is
Clearly the point C(8, 2) satisfy the equation 2x – 5y – 6 = 0.
(∵ 2(8) – 5(2) – 6 = 16 – 10 – 6 = 0)
Hence, the given points lie on the same straight line whose equation is 2x – 5y – 6 = 0.
NCERT Solutions for Class 11 Maths Chapter 10 Straight Lines Ex 10.3
Ex 10.3 Class 11 Maths Question 1.
Reduce the following equations into slope intercept form and find their slopes and the yintercepts.
(i) x + 7y = 0,
(ii) 6x + 3y5 = 0,
(iii) y=0
Solution.
(i) We have given an equation x + 7y = 0, which can be written in the form
⇒ 7y = – x ⇒ y = \(\frac { 1 }{ 7 } \)x + 0 … (1)
Also, the slope intercept form is ymx + c …(2)
On comparing (1) and (2), we get
m = \(\frac { 1 }{ 7 } \), c = 0
Hence the slope is \(\frac { 1 }{ 7 } \) and the yintercept = 0.
(ii) We have given an equation 6x + 3y – 5 = 0, which can be written in the form 3y = – 6x + 5
⇒ y = – 2x + \(\frac { 5 }{ 3 } \) …(1)
Also, the slope intercept form is y = mx + c … (2)
On comparing (1) and (2), we get
m = – 2 and c = \(\frac { 5 }{ 3 } \)
i.e. slope = – 2 and the yintercept = \(\frac { 5 }{ 3 } \)
(iii) We have given an equation y = 0
y = 0·x + 0 … (1)
Also, the slope intercept form is y = mx + c … (2) On comparing (1) and (2), we get
m = 0, c = 0.
Hence, slope is 0 and the yintercept is 0.
Ex 10.3 Class 11 Maths Question 2.
Reduce the following equations into intercept form and find their intercepts on the axes.
(i) 3x + 2y – 12 = 0,
(ii) 4x – 3y = 6,
(iii) 3y + 2 = 0
Solution.
(i) Given equation is 3x + 2y – 12 = 0 We have to reduce the given equation into intercept form, i.e., \(\frac { x }{ a } +\frac { y }{ b } =1\) …(1)
Now given, 3x + 2y = 12
⇒ \(\frac { 3x }{ 12 } +\frac { 2y }{ 12 } =1\quad \) ⇒ \( \quad \frac { x }{ 4 } +\frac { y }{ 6 } =1\) …(2)
On comparing (1) and (2), we get a = 4, b = 6 Hence, the intercepts of the line are 4 and 6.
(ii) Given equation is 4x – 3y = 6
We have to reduce the given equation into intercept form, i.e., \(\frac { x }{ a } +\frac { y }{ b } =1\) …(1)
\(\frac { 4 }{ 6 } x\frac { 3 }{ 6 } y=1\quad or\quad \frac { x }{ 3/2 } +\frac { y }{ 2 } =1\) …(2)
On comparing (1) and (2), we get
a = \(\frac { 3 }{ 2 }\) and b = – 2
Hence, the intercepts of the line are \(\frac { 3 }{ 2 }\) and 2.
(iii) Given equation is 3y + 2 = 0
We have to reduce the given equation into intercept form, i.e., \(\frac { x }{ a } +\frac { y }{ b } =1\)
3y = 2
⇒ y = \(\frac { 2 }{ 3 } \)
The above equation shows that, it is not the required equation of the intercept form as it is parallel to xaxis.
We observe that yintercept of the line is \(\frac { 2 }{ 3 } \), but there is no intercept on xaxis.
Ex 10.3 Class 11 Maths Question 3.
Reduce the following equations into normal form. Find their perpendicular distances from the origin and angle between perpendicular and the positive xaxis.
(i) x – \(\sqrt { 3 } y\) + 8 = 0,
(ii) y2 = 0,
(iii) xy = 4.
Solution.
(i) Given equation is x – \(\sqrt { 3 } y\) + 8 = 0
\(\sqrt { 3 } y\) x – \(\sqrt { 3 } y\) = 8
\(\sqrt { 3 } y\) x + \(\sqrt { 3 } y\) = 8 … (i)
Also, \(\sqrt { \left( coeff.\quad of\quad { x }^{ 2 } \right) +\left( coeff.of\quad { y }^{ 2 } \right) } \)
\(\sqrt { \left( 1 \right) ^{ 2 }+\left( \sqrt { 3 } \right) ^{ 2 } } \quad =\quad \sqrt { 1+3 } =\sqrt { 4 } =2\)
Now dividing both the sides of (1) by 2, we get
\(\frac { 1 }{ 2 } x+\frac { \sqrt { 3 } }{ 2 } y=4\)
⇒ – cos 60°x + sin 60° y = 4.
⇒ {cos (180° – 60°)) x + {sin (180° – 60°)y = 4
⇒ cos 120° x + sin 120° y = 4
∴ x cos 120° + y sin 120° = 4 is the required equation in normal form
∵ The normal form is x coso) + y sin⍵ = p
So, ⍵ = 120° and p = 4
⍵ Distance of the line from origin is 4 and the angle between perpendicular and positive xaxis is 120°.
(ii) Given equation is y – 2 = 0
⇒ y = 2
⇒ 0 · x + l · y = 2
⇒ x cos 90° + y sin 90° = 2 is the required equation in normal form
∵ The normal form is x cos⍵ + y sin⍵ = p
So, ⍵ = 90° and p = 2
⍵ Distance of the line from origin is 2 and the angle between perpendicular and positive xaxis is 90°.
(iii) Given equation is x – y = 4 … (1)
Also \(\sqrt { \left( coeff.\quad of\quad { x }^{ 2 } \right) +\left( coeff.of\quad { y }^{ 2 } \right) } \)
\(\sqrt { \left( 1 \right) ^{ 2 }+\left( 1 \right) ^{ 2 } } =\sqrt { 1+1 } =\sqrt { 2 } \)
Now dividing both the sides of (1) bt \(\sqrt { 2 } \), we get
is the required equation in normal form.
∵ The normal form is x cos⍵ + y sin⍵ = p
So, P = \(2\sqrt { 2 } \) and ⍵ = 315°
∴ Distance of the line from the origin is \(2\sqrt { 2 } \) and the angle between perpendicular and the positive xaxis is 315°.
Ex 10.3 Class 11 Maths Question 4.
Find the distance of the point (1, 1) from the line 12 (x+ 6) = 5(y — 2).
Solution.
The equation of line is 12(x + 6) = 5(y – 2) …(i)
⇒ 12x + 72 = 5y10
⇒ 12x – 5y + 82 = 0
∴ Distance of the point (1, 1) from the line (i)
\(=\frac { \left 12\left( 1 \right) 5\left( 1 \right) +82 \right }{ \sqrt { \left( 12 \right) ^{ 2 }+\left( 5 \right) ^{ 2 } } } =\frac { 65 }{ 13 } =5units\)
Ex 10.3 Class 11 Maths Question 5.
Find the points on the xaxis, whose distances from the line \(\frac { x }{ 3 } +\frac { y }{ 4 } =1\) are 4 units.
Solution.
We have a equation of line \(\frac { x }{ 3 } +\frac { y }{ 4 } =1\), which can be written as
4x + 3y – 12 = 0 … (i)
Let (a, 0) be the point on xaxis whose distance from line (i) is 4 units.
Ex 10.3 Class 11 Maths Question 6.
Find the distance between parallel lines
(i) 15x+8y34 = 0and 15x + 8y+31 =0
(ii) (x + y) + p = 0 and (x + y) – r = 0.
Solution.
If lines are Ax + By + Q = 0
and Ax + By + C_{2} = 0, then distance between
Ex 10.3 Class 11 Maths Question 7.
Find equation of the line parallel to the line 3x – 4y + 2 = 0 and passing through the point (2, 3).
Solution.
We have given an equation of line 3x – 4y + 2 = 0
Slop of the line(i) = \(\frac { 3 }{ 4 } \)
Thus, slope of any line parallel to the given line (i) is \(\frac { 3 }{ 4 } \) and passes through (2, 3), then its equation is
Ex 10.3 Class 11 Maths Question 8.
Find equation of the line perpendicular to the line x – 7y + 5 = 0 and having x intercept 3.
Solution.
Given equation is x – 7y + 5 = 0 … (i)
Slope of this line = \(\frac { 1 }{ 7 } \)
∴ Slope of any line perpendicular to the line (i) is 7 and passes through (3, 0) then
y – 0 = 7(x – 3)
[∵ Product of slope of perpendicular lines is 1]
⇒ y = 7x + 21
⇒ 7x + y – 21 = 0, is the required equation of line.
Ex 10.3 Class 11 Maths Question 9.
Find angles between the lines \(\sqrt { 3 } x\) + y = 1 and x + \(\sqrt { 3 } y\) = 1.
Solution.
The given equations are
\(\sqrt { 3 } x\) + y = 1 … (i)
x + \(\sqrt { 3 } y\) = 1 … (ii)
Since we have to find an angle between the two lines i.e., firstly we have to find the slopes of (i) and (ii).
Ex 10.3 Class 11 Maths Question 10.
The line through the points (h, 3) and (4, 1) intersects the line 7x – 9y – 19 = 0 at right angle. Find the value of h.
Solution.
Given points are (h, 3) and (4,1).
∴ Slope of the line joining (h, 3) & (4,1)
Ex 10.3 Class 11 Maths Question 11.
Prove that the line through the point (x_{1} y_{1}) and parallel to the line Ax + By + C = 0 is A(xx_{1}) + B(yy_{1}) = 0.
Solution.
Given equation of a line is Ax + By + C = 0
∴ Slope of the above line = \(\frac { A }{ B } \)
i.e. slope of any line parallel to given line and passing through (x_{1}, y_{1}) is \(\frac { A }{ B } \)
Then equation is (y – y_{2}) = \(\frac { A }{ B } \) (x – x_{1})
=> B(y – y_{1}) = A(x – x_{1})
=> A(x – x_{1}) + B(y – y_{1}) = 0.
Hence proved.
Ex 10.3 Class 11 Maths Question 12.
Two lines passing through the point (2, 3) intersects each other at an angle of 60°. If slope of one line is 2, find equation of the other line.
Solution.
We have given a point (2, 3), through which two lines are passing and intersects at an angle of 60°.
Let m be the slope of the other line
Ex 10.3 Class 11 Maths Question 13.
Find the equation of the right bisector of the line segment joining the points (3, 4) and (1, 2).
Solution.
suppose the given points are A and B.
Let M be the mid point of AB.
Ex 10.3 Class 11 Maths Question 14.
Find the coordinates of the foot of perpendicular from the point (1, 3) to the line 3x – 4y – 16 = 0.
Solution.
We have, 3x – 4y – 16 = 0
Slope of the kine(i) = \(\frac { 3 }{ 4 } \)
Then equation of any line ⊥ from (1, 3) to the given line(i) is
Ex 10.3 Class 11 Maths Question 15.
The perpendicular from the origin to the line y = mx + c meets it at the point (1,2). Find the values of m and c.
Solution.
Given, the perpendicular from the origin to the line y = mx + c meets it at the point (1, 2)
∴ 2 = m (1) + c … (i)
⇒ c – m = 2
Ex 10.3 Class 11 Maths Question 16.
If p and q are the lengths of perpendiculars from the origin to the lines x cosθ – y sinθ = k cos 2θ and x secθ + y cosecθ = k, respectively, prove that p^{2} + 4q^{2} = k^{2}.
Solution.
Given p and q are the lengths of perpendiculars from the origin to the lines x cos θ – ysinθ=k cos 2θ and xsecθ+y cosec θ = k.
Ex 10.3 Class 11 Maths Question 17.
In the triangle ABC with vertices A(2, 3), 8(4, 1) and C( 1, 2), find the equation and length of altitude from the vertex A.
Solution.
We have given a AABC with the vertices, A (2, 3), B (4, 1) and C (1, 2)
Ex 10.3 Class 11 Maths Question 18.
If p is the length of perpendicular from the origin to the line whose intercepts on the axes are a and b, then show that \(\frac { 1 }{ { p }^{ 2 } } =\frac { 1 }{ { a }^{ 2 } } +\frac { 1 }{ { b }^{ 2 } } \).
Solution.
Given, p be the length of perpendicular from the origin to the line whose intercepts
NCERT Class 11 Maths
Class 11 Maths Chapters  Maths Class 11 Chapter 10
Chapterwise NCERT Solutions for Class 11 Maths

NCERT Solutions For Class 11 Maths Chapter 1 Sets
NCERT Solutions For Class 11 Maths Chapter 2 Functions and relations
NCERT Solutions For Class 11 Maths Chapter 3 Trigonometric functions
NCERT Solutions For Class 11 Maths Chapter 4 Principle of mathematical induction
NCERT Solutions For Class 11 Maths Chapter 5 Quadratic equations and complex numbers
NCERT Solutions For Class 11 Maths Chapter 6 Linear Inequalities
NCERT Solutions For Class 11 Maths Chapter 7 Permutations and combinations
NCERT Solutions For Class 11 Maths Chapter 8 Binomial Theorem
NCERT Solutions For Class 11 Maths Chapter 9 Sequences and series
NCERT Solutions For Class 11 Maths Chapter 10 Straight lines
NCERT Solutions For Class 11 Maths Chapter 11 Conic sections
NCERT Solutions For Class 11 Maths Chapter 12 Introduction to threedimensional geometry
NCERT Solutions For Class 11 Maths Chapter 13 Limits and derivatives
NCERT Solutions For Class 11 Maths Chapter 14 Mathematical Reasoning
NCERT Solutions For Class 11 Maths Chapter 15 Statistics
NCERT Solutions For Class 11 Maths Chapter 16 Probability
NCERT Solutions for Class 12 All Subjects  NCERT Solutions for Class 10 All Subjects 
NCERT Solutions for Class 11 All Subjects  NCERT Solutions for Class 9 All Subjects 
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