Page 1
Co-ordinate Geometry
Practice Set 5.1
Q. 1. Find the distance between each of the following pairs of points.
(1) A(2, 3), B(4, 1)
(2) P(-5, 7), Q(-1, 3)
(3) R(0, -3), S(0, 5/2)
(4) L(5, -8), M(-7, -3)
(5) T(-3, 6), R(9, -10)
(6) , X(11, 4)
Answer : The distance between points A(x1, y1) and B(x2, y2) is given by,
1. Given Points: A(2, 3) and B(4, 1)
We can see that,x1 = 2
x2 = 4
y1 = 3
y2 = 1
Putting the values in the distance formula we get, d =
? d =
? d = v8
2. Given Points: P(-5, 7) and Q(-1, 3)
we can see that,x1 = -5
x2 = -1
y1 = 7
y2 = 3
Putting these values in distance formula we get,
d =
d = v3 2
Page 2
Co-ordinate Geometry
Practice Set 5.1
Q. 1. Find the distance between each of the following pairs of points.
(1) A(2, 3), B(4, 1)
(2) P(-5, 7), Q(-1, 3)
(3) R(0, -3), S(0, 5/2)
(4) L(5, -8), M(-7, -3)
(5) T(-3, 6), R(9, -10)
(6) , X(11, 4)
Answer : The distance between points A(x1, y1) and B(x2, y2) is given by,
1. Given Points: A(2, 3) and B(4, 1)
We can see that,x1 = 2
x2 = 4
y1 = 3
y2 = 1
Putting the values in the distance formula we get, d =
? d =
? d = v8
2. Given Points: P(-5, 7) and Q(-1, 3)
we can see that,x1 = -5
x2 = -1
y1 = 7
y2 = 3
Putting these values in distance formula we get,
d =
d = v3 2
3. Given Points: R(0, -3), S(0, 5/2)
we can see that,x1 = 0
x2 = 0
y1 = -3
y2 = 5/2
On putting these values in distance formula we get,
d =
d =
d =
4. Given Points: L(5, -8), M(-7, -3)
we can see that,
x1 = 5
x2 = -7
y1 = -8
y2 = -3
On putting these values in distance formula we get,
d =
d =
d = v1 6 9 = 13
5. Given Points: T(-3, 6), R(9, -10)
we can see that,
x1 = -3
x2 = 9
y1 = 6
y2 = -10
Page 3
Co-ordinate Geometry
Practice Set 5.1
Q. 1. Find the distance between each of the following pairs of points.
(1) A(2, 3), B(4, 1)
(2) P(-5, 7), Q(-1, 3)
(3) R(0, -3), S(0, 5/2)
(4) L(5, -8), M(-7, -3)
(5) T(-3, 6), R(9, -10)
(6) , X(11, 4)
Answer : The distance between points A(x1, y1) and B(x2, y2) is given by,
1. Given Points: A(2, 3) and B(4, 1)
We can see that,x1 = 2
x2 = 4
y1 = 3
y2 = 1
Putting the values in the distance formula we get, d =
? d =
? d = v8
2. Given Points: P(-5, 7) and Q(-1, 3)
we can see that,x1 = -5
x2 = -1
y1 = 7
y2 = 3
Putting these values in distance formula we get,
d =
d = v3 2
3. Given Points: R(0, -3), S(0, 5/2)
we can see that,x1 = 0
x2 = 0
y1 = -3
y2 = 5/2
On putting these values in distance formula we get,
d =
d =
d =
4. Given Points: L(5, -8), M(-7, -3)
we can see that,
x1 = 5
x2 = -7
y1 = -8
y2 = -3
On putting these values in distance formula we get,
d =
d =
d = v1 6 9 = 13
5. Given Points: T(-3, 6), R(9, -10)
we can see that,
x1 = -3
x2 = 9
y1 = 6
y2 = -10
On putting these values in distance formula we get,
d =
d =
d = 20
6. Given Points: W( ), X(11, 4)
we can see that,
x1 = -7/2
x2 = 11
y1 = 4
y2 = 4
On putting these values in distance formula we get,
d =
d =
d =
Q. 2. Determine whether the points are collinear.
(1) A(1, -3), B(2, -5), C(-4, 7)
(2) L(-2, 3), M(1, -3), N(5, 4)
(3) R(0, 3), D(2, 1), S(3, -1)
(4) P(-2, 3), Q(1, 2), R(4, 1)
Answer : If Three points (a,b), (c,d), (e,f) are collinear then the area formed by the
triangle by the three points is zero.
(a,b) = (1,-3)
Page 4
Co-ordinate Geometry
Practice Set 5.1
Q. 1. Find the distance between each of the following pairs of points.
(1) A(2, 3), B(4, 1)
(2) P(-5, 7), Q(-1, 3)
(3) R(0, -3), S(0, 5/2)
(4) L(5, -8), M(-7, -3)
(5) T(-3, 6), R(9, -10)
(6) , X(11, 4)
Answer : The distance between points A(x1, y1) and B(x2, y2) is given by,
1. Given Points: A(2, 3) and B(4, 1)
We can see that,x1 = 2
x2 = 4
y1 = 3
y2 = 1
Putting the values in the distance formula we get, d =
? d =
? d = v8
2. Given Points: P(-5, 7) and Q(-1, 3)
we can see that,x1 = -5
x2 = -1
y1 = 7
y2 = 3
Putting these values in distance formula we get,
d =
d = v3 2
3. Given Points: R(0, -3), S(0, 5/2)
we can see that,x1 = 0
x2 = 0
y1 = -3
y2 = 5/2
On putting these values in distance formula we get,
d =
d =
d =
4. Given Points: L(5, -8), M(-7, -3)
we can see that,
x1 = 5
x2 = -7
y1 = -8
y2 = -3
On putting these values in distance formula we get,
d =
d =
d = v1 6 9 = 13
5. Given Points: T(-3, 6), R(9, -10)
we can see that,
x1 = -3
x2 = 9
y1 = 6
y2 = -10
On putting these values in distance formula we get,
d =
d =
d = 20
6. Given Points: W( ), X(11, 4)
we can see that,
x1 = -7/2
x2 = 11
y1 = 4
y2 = 4
On putting these values in distance formula we get,
d =
d =
d =
Q. 2. Determine whether the points are collinear.
(1) A(1, -3), B(2, -5), C(-4, 7)
(2) L(-2, 3), M(1, -3), N(5, 4)
(3) R(0, 3), D(2, 1), S(3, -1)
(4) P(-2, 3), Q(1, 2), R(4, 1)
Answer : If Three points (a,b), (c,d), (e,f) are collinear then the area formed by the
triangle by the three points is zero.
(a,b) = (1,-3)
(c,d) = (2,-5)
(e,f) = (-4,7)
Hence the points are collinear.
2. (a,b) = (-2,3)
(c,d) = (1,-3)
(e,f) = (5,4)
Area =
Area =
Hence the points are not collinear.
3. (a,b) = (0,3)
(c,d) = (2,1)
(e,f) = (3,-1)
Area =
Area =
Hence the points are non collinear.
4. (a,b) = (-2,3)
(c,d) = (1,2)
(e,f) = (4,1)
Page 5
Co-ordinate Geometry
Practice Set 5.1
Q. 1. Find the distance between each of the following pairs of points.
(1) A(2, 3), B(4, 1)
(2) P(-5, 7), Q(-1, 3)
(3) R(0, -3), S(0, 5/2)
(4) L(5, -8), M(-7, -3)
(5) T(-3, 6), R(9, -10)
(6) , X(11, 4)
Answer : The distance between points A(x1, y1) and B(x2, y2) is given by,
1. Given Points: A(2, 3) and B(4, 1)
We can see that,x1 = 2
x2 = 4
y1 = 3
y2 = 1
Putting the values in the distance formula we get, d =
? d =
? d = v8
2. Given Points: P(-5, 7) and Q(-1, 3)
we can see that,x1 = -5
x2 = -1
y1 = 7
y2 = 3
Putting these values in distance formula we get,
d =
d = v3 2
3. Given Points: R(0, -3), S(0, 5/2)
we can see that,x1 = 0
x2 = 0
y1 = -3
y2 = 5/2
On putting these values in distance formula we get,
d =
d =
d =
4. Given Points: L(5, -8), M(-7, -3)
we can see that,
x1 = 5
x2 = -7
y1 = -8
y2 = -3
On putting these values in distance formula we get,
d =
d =
d = v1 6 9 = 13
5. Given Points: T(-3, 6), R(9, -10)
we can see that,
x1 = -3
x2 = 9
y1 = 6
y2 = -10
On putting these values in distance formula we get,
d =
d =
d = 20
6. Given Points: W( ), X(11, 4)
we can see that,
x1 = -7/2
x2 = 11
y1 = 4
y2 = 4
On putting these values in distance formula we get,
d =
d =
d =
Q. 2. Determine whether the points are collinear.
(1) A(1, -3), B(2, -5), C(-4, 7)
(2) L(-2, 3), M(1, -3), N(5, 4)
(3) R(0, 3), D(2, 1), S(3, -1)
(4) P(-2, 3), Q(1, 2), R(4, 1)
Answer : If Three points (a,b), (c,d), (e,f) are collinear then the area formed by the
triangle by the three points is zero.
(a,b) = (1,-3)
(c,d) = (2,-5)
(e,f) = (-4,7)
Hence the points are collinear.
2. (a,b) = (-2,3)
(c,d) = (1,-3)
(e,f) = (5,4)
Area =
Area =
Hence the points are not collinear.
3. (a,b) = (0,3)
(c,d) = (2,1)
(e,f) = (3,-1)
Area =
Area =
Hence the points are non collinear.
4. (a,b) = (-2,3)
(c,d) = (1,2)
(e,f) = (4,1)
Area =
Area =
Q. 3. Find the point on the X-axis which is equidistant from A(-3, 4) and B(1, -4).
Answer : A point in the x = axis is of the form (a,0)
Distance d between two points(a,b) and (c,d)is given by
Distance between (-3,4) and (a,0) =
D =
D
Distance between (1,-4) and (a,0)
D =
D =
As the two points are equidistant from the point (a.0)
=
Squaring both sides, we get
(1-a)
2
+ 16 = (3 + a)
2
+ 16
1 + a
2
-2a = 9 + a
2
+ 6a
8a = -8
a = -1
Hence the point is (-1,0)
Read More