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R S AGGARWAL AND V AGGARWAL Solutions Mathematics Class 9 Chapter 5 Coordinate Geometry

R S AGGARWAL AND V AGGARWAL Solutions for Class 9 Maths Chapter 5 – Coordinate Geometry

Chapter 5 – Coordinate Geometry Exercise Ex. 5

Question 1

On the plane of a graph paper draw X’OX and YOY’ as
coordinate axes and plot each of the following points.

(i) A(5, 3) (ii)
B(6, 2) (iii) C(-5, 3) (iv) D(4, -6)

(v) E(-3, -2) (vi)
F(-4, 4) (vii) G(3, -4) (viii) H(5, 0)

(ix) I(0, 6) (x)
J(-3, 0) (xi) K(0, -2) (xii) O(0, 0)

Solution 1

The
given points are plotted as follows:

R-s-aggarwal-and-v-aggarwal Solutions Cbse Class 9 Mathematics Chapter - Coordinate Geometry

Question 2

Write down the coordinates of each of the points A, B, C, D, E shown below:

R-s-aggarwal-and-v-aggarwal Solutions Cbse Class 9 Mathematics Chapter - Coordinate Geometry

Solution 2

Draw the perpendiculars from the AF, BG, CH, DI and EJ on the x-axis.

(1) The distance of A from the y-axis = OF = -6 units

     The distance of A from the x-axis = AF = 5 units

     Hence, the coordinate of A are (-6, 5)

(2)The distance of B from the y-axis = OG = 5 units

     The distance of B from the x-axis = BG = 4 units

     Hence, the coordinate of B are (5, 4)

(3)The distance of C from the y-axis = OH = -3 units

     The distance of C from the x-axis = HC = 2 units

     Hence, the coordinate of C are (-3, 2)

(4)The distance of D from the y-axis = OI = 2 units

     The distance of D from the x-axis = ID = -2 units

     Hence, the coordinate of D are (2, -2)

(5)The distance of E from the y-axis = OJ = -1 unit

     The distance of E from the x-axis = JE = -4 units

     Hence, the coordinate of E are (-1, -4)

Thus, the coordinates of A, B, C, D and E are respectively, A(-6,5), B(5,4), C(-3,2), D(2,-2) and E(-1,-4)

Question 3

For each of the following points, write the quadrant in
which it lies.

(i) (-6, 3) (ii)
(-5, -3) (iii) (11, 6) (iv) (1, -4)

(v) (-7, -4) (vi)
(4, -1) (vii) (-3, 8) (viii) (3, -8)

Solution 3

(i) (-6, 3):

 x co-ordinate
is negative and y co-ordinate is positive.

 Hence, (-6, 3) lies
in the 2nd Quadrant.

(ii) (-5, -3) :

 x co-ordinate
and y co-ordinate both are negative.

 Hence, (-5, -3)
lies in the 3rd Quadrant.

(iii) (11, 6):

  x co-ordinate and y co-ordinate both are positive.

  Hence, (11, 6) lies in the 1st Quadrant.

(iv) (1, -4):

 x co-ordinate
is positive and y co-ordinate is negative.

  Hence, (1, -4) lies in the 4th
Quadrant.

(v) (-7, -4):

 x co-ordinate
and y co-ordinate both are negative.

 Hence, (-7, -4)
lies in the 3rd Quadrant.

(vi) (4, -1):

 x co-ordinate
is positive and y co-ordinate is negative.

 Hence, (4, -1)
lies in the 4th Quadrant.

(vii) (-3, 8):

 x co-ordinate
is negative and y co-ordinate is positive.

 Hence, (-3, 8)
lies in the 2nd Quadrant.

(viii) (3, -8):

 x
co-ordinate is positive and y co-ordinate is negative.

 Hence, (3, -8)
lies in the 4th Quadrant.

Question 4

Write the axis on which the given point lies.

(i) (2, 0) (ii) (0,
-5) (iii) (-4, 0) (iv) (0, -1)

Solution 4

(i) (2, 0) lies on the x-axis as the co-ordinates of every
point on the x-axis are of the form (x, 0).

(ii) (0, -5) lies on the y-axis as the co-ordinates of every
point on the y-axis are of the form (0, y).

(iii) (-4, 0) lies on the x-axis as the co-ordinates of every
point on the x-axis are of the form (x, 0).

(iv) (0, -1) lies on the y-axis as the co-ordinates of every
point on the y-axis are of the form (0, y).

Question 5

Which of the following points lies on the x-axis?

(i) A(0, 8) (ii)
B(4, 0) (iii) C(0, -3) (iv) D(-6, 0)

(v) E(2, 1)  (vi) F(-2, -1) (vii) G(-1, 0) (viii) H(0, -2)

Solution 5

The co-ordinates of every point on
the X-axis are of the form (x, 0).

Hence, following points lie on the
x-axis:

(ii) B(4, 0)

(iv) D(-6, 0)

(vii) G(-1, 0)

Question 6

Plot the points A(2,5), B(-2, 2)
and C(4, 2) on a graph paper. Join AB, BC and AC. Calculate the area of
ΔABC.

Solution 6

The
given points are plotted on the graph paper as follows:

R-s-aggarwal-and-v-aggarwal Solutions Cbse Class 9 Mathematics Chapter - Coordinate Geometry

R-s-aggarwal-and-v-aggarwal Solutions Cbse Class 9 Mathematics Chapter - Coordinate Geometry

Question 7

Three vertices of a rectangle ABCD are A(3,
1), B(-3, 1) and C(-3, 3). Plot these points on graph paper and find the
coordinates of the fourth vertex D. Also, find the area of rectangle ABCD.

HINT Coordinates of D are (3,
3).

Solution 7

The
given vertices of rectangle ABCD are plotted on graph paper as follows:

R-s-aggarwal-and-v-aggarwal Solutions Cbse Class 9 Mathematics Chapter - Coordinate Geometry

The
coordinates of fourth vertex D are (3, 3)

Area
of rectangle ABCD = Length
× Breadth

= AB × BC

= 6 × 2

= 12 square units

Chapter 5 – Coordinate Geometry Exercise MCQ

Question 1

In which quadrant does the point (-7, -4) lie?

(a) IV

(b) II

(c) III

(d) None
of these

Solution 1

Correct
option: (c)

Since,
both the coordinates of given point are negative, it lies in Quadrant III.

Question 2

The point which lies on the y-axis at a distance of 5
units in the negative direction of the y-axis is

(a) (-5,
0)

(b) (0,
-5)

(c) (5,
0)

(d) (0,
5)

Solution 2

Correct
option: (b)

The
point which lies on the y-axis at a distance of 5 units in the negative
direction of the y-axis is (0, -5).

Question 3

The ordinate of every point on the x-axis is

(a) 1

(b) -1

(c) 0

(d) any
real number

Solution 3

Correct
option: (c)

The ordinate (y co-ordinate) of
every point on the x-axis is 0.

Question 4

If the y-coordinate of a point is zero then this point
always lies

(a) on
the y-axis

(b) on
the x-axis

(c) in
the I quadrant

(d) in
the IV quadrant

Solution 4

Correct
option: (b)

If the y-coordinate of a point is zero then this point
always lies on the x-axis.

Question 5

If O(0,0), A(3, 0), B(3, 4), C(0, 4) are four given points
then the figure OABC is a

(a) square

(b) rectangle

(c) trapezium

(d) rhombus

Solution 5

Correct
option: (b)

By
plotting the given points, we find that figure OABC is a rectangle.

R-s-aggarwal-and-v-aggarwal Solutions Cbse Class 9 Mathematics Chapter - Coordinate Geometry

Question 6

If A(-2, 3) and B(-3, 5) are two
given points then (abscissa of A) – (abscissa of B) = ?

(a) -2

(b) 1

(c) -1

(d) 2

Solution 6

Correct
option: (b)

Abscissa of A – Abscissa of B

= -2 – (-3)

= -2 + 3

= 1

Question 7

The perpendicular distance of the point A(3, 4) from the
y-axis is

(a) 3

(b) 4

(c) 5

(d) 7

Solution 7

Correct
option: (a)

The perpendicular distance of the point A(3,
4) from the y-axis is 3 units.

Question 8

Abscissa of a point is positive in

(a) I and II quadrants

(b) I and IV quadrants

(c) I quadrant only

(d) II quadrant only

Solution 8

Correct option: (b)

R-s-aggarwal-and-v-aggarwal Solutions Cbse Class 9 Mathematics Chapter - Coordinate Geometry

R-s-aggarwal-and-v-aggarwal Solutions Cbse Class 9 Mathematics Chapter - Coordinate Geometry

Question 9

The point at which the
two coordinate axes meet is called

(a) The abscissa

(b) The ordinate

(c) The origin

(d) The quadrant

Solution 9

R-s-aggarwal-and-v-aggarwal Solutions Cbse Class 9 Mathematics Chapter - Coordinate Geometry

Question 10

The point whose ordinate is 3 and which lies on the y-axis
is

(a) (3, 0)

(b) (0, 3)

(c) (3,
3)

(d) (1, 3)

Solution 10

Correct
option: (b)

If a point lies on y-axis, then its abscissa is 0.

Hence, the point whose ordinate is 3 and which lies on the
y-axis is (0, 3).

Question 11

Which of the following
points lies on the line y = 2x + 3?

(a) (2,8)

(b) (3,9)

(c) (4,12)

(d) (5,15)

Solution 11

R-s-aggarwal-and-v-aggarwal Solutions Cbse Class 9 Mathematics Chapter - Coordinate Geometry

Question 12

If x > 0 and y

(a) Quadrant I

(b) Quadrant III

(c) Quadrant II

(d) Quadrant IV

Solution 12

Correct option: (d)

R-s-aggarwal-and-v-aggarwal Solutions Cbse Class 9 Mathematics Chapter - Coordinate Geometry

R-s-aggarwal-and-v-aggarwal Solutions Cbse Class 9 Mathematics Chapter - Coordinate Geometry

Question 13

Which of the following
points does not lie on the line y = 3x + 4?

(a) (1,7)

(b) (2,10)

(c) (-1,1)

(d) (4,12)

Solution 13

R-s-aggarwal-and-v-aggarwal Solutions Cbse Class 9 Mathematics Chapter - Coordinate Geometry

Question 14

Which of the following points does not lie in any
quadrant?

(a) (3,
-6)

(b) (-3, 4)

(c) (5,
7)

(d) (0, 3)

Solution 14

Correct
option: (d)

The abscissa of point (0, 3) is 0. Hence, it lies on
y-axis.

Question 15

The area of ΔAOB having vertices A(0,6), O(0,0) and B(6, 0) is

(a) 12
sq units

(b) 36
sq units

(c) 18
sq units

(d) 24
sq units

Solution 15

Correct
option: (c)

R-s-aggarwal-and-v-aggarwal Solutions Cbse Class 9 Mathematics Chapter - Coordinate Geometry

Clearly, ΔAOB
is a right-angled triangle.

R-s-aggarwal-and-v-aggarwal Solutions Cbse Class 9 Mathematics Chapter - Coordinate Geometry

Question 16

If a < 0 and b > 0 then the point (a, b) lies in
quadrant

(a) IV

(b) II

(c) III

(d) none of these

Solution 16

Correct
option: (b)

Since,
x co-ordinate is negative and y co-ordinate is positive, the given point lies
in Quadrant II.

Question 17

A point both of whose
coordinates are negative lies in

(a) Quadrant I

(b) Quadrant II

(c) Quadrant III

(d) Quadrant IV

Solution 17

Correct
option: (c)

R-s-aggarwal-and-v-aggarwal Solutions Cbse Class 9 Mathematics Chapter - Coordinate Geometry

R-s-aggarwal-and-v-aggarwal Solutions Cbse Class 9 Mathematics Chapter - Coordinate Geometry

Question 18

The points (other than
the origin) for which the abscissa is equal to the ordinate lie in

(a) Quadrant I only

(b) Quadrants I and
II

(c) Quadrants I and
III

(d) Quadrants II
and IV

Solution 18

Correct
option: (c)

R-s-aggarwal-and-v-aggarwal Solutions Cbse Class 9 Mathematics Chapter - Coordinate Geometry

R-s-aggarwal-and-v-aggarwal Solutions Cbse Class 9 Mathematics Chapter - Coordinate Geometry

Question 19

The point (-5, 3) and (3, -5) lie in the

(a) same
quadrant

(b) II
and III quadrants respectively

(c) II
and IV quadrants respectively

(d) IV
and II quadrants respectively

Solution 19

Correct
option: (c)

For
point (-5, 3), the x co-ordinate is negative and the y co-ordinate is
positive. Hence, it lies in Quadrant II.

For
point (3, -5), the x co-ordinate is positive and the y co-ordinate is
negative. Hence, it lies in Quadrant IV.

Question 20

Points (1, -1), (2, -2), (-3, -4), (4, -5)

(a) all
lie in the II quadrant

(b) all
lie in the III quadrant

(c) all
lie in the IV quadrant

(d) do
not lie in the same quadrant

Solution 20

Correct
option: (d)

Points
(1, -1), (2, -2) and (4, -5) lie in Quadrant IV, but point (-3, -4) lies in
Quadrant III.

Hence,
all the given points do not lie in the same quadrant.

Question 21

Point (0, -8) lies

(a) in
the II quadrant

(b) in
the IV quadrant

(c) on
the x-axis

(d) on
the y-axis

Solution 21

Correct
option: (d)

Point
(0, -8) lies on y-axis as its x co-ordinate is 0.

Question 22

Point (-7, 0) lies

(a) on
the negative direction of the x-axis

(b) on
the negative direction of the y-axis

(c) in
the III quadrant

(d) in
the IV quadrant

Solution 22

Correct
option: (a)

Point (-7, 0) lies on negative direction of the x-axis as its x co-ordinate is negative and y co-ordinate is zero.

 

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