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Coordinate Geometry

Class 9th Mathematics NCERT Exemplar Solution
Exercise 3.1
  1. Point (-3, 5) lies in theA. first quadrant B. second quadrant C. third quadrant…
  2. Signs of the abscissa and ordinate of a point in the second quadrant are…
  3. Point (0, -7) liesA. on the x -axis B. in the second quadrant C. on the y-axis…
  4. Point (- 10, 0) liesA. on the negative direction of the x-axis B. on the…
  5. Abscissa of all the points on the x-axis isA. 0 B. 1 C. 2 D. any number…
  6. Ordinate of all points on the x-axis isA. 0 B. 1 C. - 1 D. any number…
  7. The point at which the two coordinate axes meet is called theA. abscissa B.…
  8. A point both of whose coordinates are negative will lie inA. I quadrant B. II…
  9. Points (1, - 1), (2, - 2), (4, - 5), (- 3, - 4)A. lie in II quadrant B. lie in…
  10. If y coordinate of a point is zero, then this point always liesA. in I quadrant…
  11. The points (-5, 2) and (2, - 5) lie in theA. same quadrant B. II and III…
  12. If the perpendicular distance of a point P from the x-axis is 5 units and the…
  13. On plotting the points O (0, 0), A (3, 0), B (3, 4), C (0, 4) and joining OA,…
  14. If P (- 1, 1), Q (3, - 4), R(1, -1), S(-2, -3) and T (- 4, 4) are plotted on…
  15. If the coordinates of the two points are P (-2, 3) and Q(-3, 5), then (abscissa…
  16. If P (5, 1), Q (8, 0), R (0, 4), S (0, 5) and O (0, 0) are plotted on the graph…
  17. Abscissa of a point is positive inA. I and II quadrants B. I and IV quadrants…
  18. The points whose abscissa and ordinate have different signs will lie inA. I and…
  19. In Fig. 3.1, coordinates of P are A. (- 4, 2) B. (-2, 4) C. (4, - 2) D. (2, -…
  20. In Fig. 3.2, the point identified by the coordinates (-5, 3) is A. T B. R C. L…
  21. The point whose ordinate is 4 and which lies on y-axis isA. (4, 0) B. (0, 4) C.…
  22. Which of the points P(0, 3), Q(1, 0), R(0, -1), S(-5, 0), T(1, 2) do not lie on…
  23. The point which lies on y-axis at a distance of 5 units in the negative…
  24. The perpendicular distance of the point P (3, 4) from the y-axis isA. 3 B. 4 C.…
Exercise 3.2
  1. Point (3, 0) lies in the first quadrant. Write whether the following statements…
  2. Points (1, -1) and (-1, 1) lie in the same quadrant. Write whether the following…
  3. The coordinates of a point whose ordinate is - 1/2 and abscissa is 1 are (- 1/2…
  4. A point lies on y-axis at a distance of 2 units from the x-axis. Its coordinates…
  5. (-1, 7) is a point in the II quadrant. Write whether the following statements…
Exercise 3.3
  1. Write the coordinates of each of the points P, Q, R, S, T and O from the Fig.…
  2. Plot the following points and write the name of the figure obtained by joining…
  3. Plot the points (x, y) given by the following table: |c|c|c|c|c|c|c|…
  4. Plot the following points and check whether they are collinear or not: (i) (1,…
  5. Without plotting the points indicate the quadrant in which they will lie, if (i)…
  6. In Fig. 3.6, LM is a line parallel to the y-axis at a distance of 3 units. (i)…
  7. In which quadrant or on which axis each of the following points lie? (- 3, 5),…
  8. Which of the following points lie on y-axis? A(1, 1), B(1, 0), C(0, 1), D(0, 0),…
  9. Plot the points (x, y) given by the following table. Use scale 1 cm = 0.25 units…
  10. A point lies on the x-axis at a distance of 7 units from the y-axis. What are…
  11. Find the coordinates of the point (i) which lies on x and y axes both. (ii)…
  12. Taking 0.5 cm as 1 unit, plot the following points on the graph paper: A(1, 3),…
Exercise 3.4
  1. Points A (5, 3), B (-2, 3) and D (5, -4) are three vertices of a square ABCD.…
  2. Write the coordinates of the vertices of a rectangle whose length and breadth…
  3. Plot the points P (1, 0), Q (4, 0) and S (1, 3). Find the coordinates of the…
  4. From the Fig. 3.8, answer the following: (i) Write the points whose abscissa is…
  5. Plot the points A (1, -1) and B (4, 5) (i) Draw a line segment joining these…

Exercise 3.1
Question 1.

Point (–3, 5) lies in the
A. first quadrant

B. second quadrant

C. third quadrant

D. fourth quadrant


Answer:


(-3,5) is of form (-x,y).


(B) Second quadrant.


Question 2.

Signs of the abscissa and ordinate of a point in the second quadrant are respectively
A. +, +

B. –, –

C. –, +

D. +, –


Answer:

Second quadrant has form (-x,y)

C. -,+


Question 3.

Point (0, –7) lies
A. on the x –axis

B. in the second quadrant

C. on the y-axis

D. in the fourth quadrant


Answer:

As abscissa is 0. It lies on the y-axis.

(C) on the y-axis.


Question 4.

Point (– 10, 0) lies
A. on the negative direction of the x-axis

B. on the negative direction of the y-axis

C. in the third quadrant

D. in the fourth quadrant


Answer:

Here ordinate is 0. So it lies on the x-axis.

(A) on the negative direction of the x-axis.


Question 5.

Abscissa of all the points on the x-axis is
A. 0

B. 1

C. 2

D. any number


Answer:

Point on x-axis has ordinate as 0 and abscissa can be any number.

(D) any number.


Question 6.

Ordinate of all points on the x-axis is
A. 0

B. 1

C. – 1

D. any number


Answer:

Point on x-axis has ordinate as 0 and abscissa can be any number.

(A) 0.


Question 7.

The point at which the two coordinate axes meet is called the
A. abscissa

B. ordinate

C. origin

D. quadrant


Answer:

The point where the two coordinate axes meet is called origin (0,0).

(C) origin.


Question 8.

A point both of whose coordinates are negative will lie in
A. I quadrant

B. II quadrant

C. III quadrant

D. IV quadrant


Answer:

In III quadrant, the form is (-x,-y).

(C) III quadrant.


Question 9.

Points (1, – 1), (2, – 2), (4, – 5), (– 3, – 4)
A. lie in II quadrant

B. lie in III quadrant

C. lie in IV quadrant

D. do not lie in the same quadrant


Answer:

All the points are not of the same form.

(D) do not lie in the same quadrant.


Question 10.

If y coordinate of a point is zero, then this point always lies
A. in I quadrant

B. in II quadrant

C. on x - axis

D. on y – axis


Answer:

Point on x-axis has ordinate(y-coordinate) as 0 and abscissa can be any number.

(C) on x-axis.


Question 11.

The points (–5, 2) and (2, – 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


Answer:


(-5,2) is of the form (-x,y) so it lies in the II quadrant.


(2,-5) is of the form (x,-y) so it lies in IV quadrant.


(C) II and IV quadrants, respectively


Question 12.

If the perpendicular distance of a point P from the x-axis is 5 units and the foot of the perpendicular lies on the negative direction of x-axis, then the point P has
A. x – coordinate = – 5

B. y - coordinate = 5 only

C. y – coordinate = – 5 only

D. y – coordinate = 5 or –5


Answer:

Perpendicular distance from x-axis = Ordinate = 5

The negative direction of x-axis doesn’t decide the sign of the ordinate.


(D) y-coordinate = 5 or -5.


Question 13.

On plotting the points O (0, 0), A (3, 0), B (3, 4), C (0, 4) and joining OA, AB, BC and CO which of the following figure is obtained?
A. Square

B. Rectangle

C. Trapezium

D. Rhombus


Answer:


(B) rectangle.


Question 14.

If P (– 1, 1), Q (3, – 4), R(1, –1), S(–2, –3) and T (– 4, 4) are plotted on the graph-paper, then the point(s) in the fourth quadrant are
A. P and T

B. Q and RC. Only S

D. P and R


Answer:

In IV quadrant, the point is of form ( x,-y)

The points of (x,-y) are Q(3,-4) and R(1,-1).


(B) Q and R.


Question 15.

If the coordinates of the two points are P (–2, 3) and Q(–3, 5), then (abscissa of P) – (abscissa of Q) is
A. – 5

B. 1

C. – 1

D. – 2


Answer:

Abscissa of P =-2

Abscissa of Q=-3


(Abscissa of P) –(Abscissa of Q)=(-2)-(-3)=1


(B) 1.


Question 16.

If P (5, 1), Q (8, 0), R (0, 4), S (0, 5) and O (0, 0) are plotted on the graph paper, then the point(s) on the x-axis are
A. P and R

B. R and S

C. Only Q

D. Q and O


Answer:

On the x-axis, ordinate is 0. Such points are Q(8,0) and O (0,0).

(D) Q and O.


Question 17.

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


Answer:

Abscissa positive implies form (x,y) and (x,-y). These forms are in I and IV quadrant.

(B) I and IV quadrants.


Question 18.

The points whose abscissa and ordinate have different signs will lie in
A. I and II quadrants

B. II and III quadrants

C. I and III quadrants

D. II and IV quadrants


Answer:

Different signs implies forms (-x,y) and (x,-y).These forms are in II and IV quadrant.

(D) II and IV quadrants.


Question 19.

In Fig. 3.1, coordinates of P are


A. (– 4, 2)

B. (–2, 4)

C. (4, – 2)

D. (2, – 4)


Answer:

P lies in the II quadrant and hence is of the form (-x,y). Value of abscissa and ordinate of P are -2 and 4 respectively.

(B) (-2,4)


Question 20.

In Fig. 3.2, the point identified by the coordinates (–5, 3) is


A. T

B. R

C. L

D. S


Answer:

(-5,3) is of the form (-x,y) so it lies in the quadrant. The point corresponding to (-5,3) in II quadrant is L.

C. L.


Question 21.

The point whose ordinate is 4 and which lies on y-axis is
A. (4, 0)

B. (0, 4)

C. (1, 4)

D. (4, 2)


Answer:

Ordinate = 4 and as it lies on the y-axis, abscissa is 0.

(B) (0,4).


Question 22.

Which of the points P(0, 3), Q(1, 0), R(0, –1), S(–5, 0), T(1, 2) do not lie on the x–axis?
A. P and R only

B. Q and S only

C. P, R and T

D. Q, S and T


Answer:

The points that lie on the x-axis are Q(1,0) and S (-5,0).

So the points that do not lie on the x-axis are P, R and T.


(C) P, R and T.


Question 23.

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

B. (5, 0)

C. (0, – 5)

D. (– 5, 0)


Answer:

(0,-5)


Question 24.

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

B. 4

C. 5

D. 7


Answer:

The perpendicular distance of a point from y-axis is its abscissa.

(A) 3.



Exercise 3.2
Question 1.

Write whether the following statements are True or False? Justify your answer.

Point (3, 0) lies in the first quadrant.


Answer:

False.

(3,0) lies on the x-axis.



Question 2.

Write whether the following statements are True or False? Justify your answer.

Points (1, –1) and (–1, 1) lie in the same quadrant.


Answer:

False

They are not of the same form. (1, -1) is in IV quadrant and (-1, 1) is in II quadrant.



Question 3.

Write whether the following statements are True or False? Justify your answer.

The coordinates of a point whose ordinate is and abscissa is 1 are .


Answer:

False.

The point is (1, -1/2).



Question 4.

Write whether the following statements are True or False? Justify your answer.

A point lies on y-axis at a distance of 2 units from the x-axis. Its coordinates are (2, 0).


Answer:

False.

The point is (0,2).



Question 5.

Write whether the following statements are True or False? Justify your answer.

(–1, 7) is a point in the II quadrant.


Answer:

True.

(-1, 7) is of the form (-x, y) and hence lies in the II quadrant.




Exercise 3.3
Question 1.

Write the coordinates of each of the points P, Q, R, S, T and O from the Fig. 3.5.



Answer:

Coordinates are as:

P(1,1)


Q(-3,0)


R(-2,-3)


S(2,1)


T(4,-2)


O(0,0)



Question 2.

Plot the following points and write the name of the figure obtained by joining them in order:

P(– 3, 2), Q (– 7, – 3), R (6, – 3), S (2, 2)


Answer:


The figure obtained is Trapezium.



Question 3.

Plot the points (x, y) given by the following table:



Answer:




Question 4.

Plot the following points and check whether they are collinear or not:

(i) (1, 3), (– 1, – 1), (– 2, – 3)

(ii) (1, 1), (2, – 3), (– 1, – 2)

(iii) (0, 0), (2, 2), (5, 5)


Answer:

(i)


The points are collinear.


(ii)



The points are not collinear.


(iii)


The points are collinear.



Question 5.

Without plotting the points indicate the quadrant in which they will lie, if

(i) ordinate is 5 and abscissa is – 3

(ii) abscissa is – 5 and ordinate is – 3

(iii) abscissa is – 5 and ordinate is 3

(iv) ordinate is 5 and abscissa is 3


Answer:

(i) The point is (-3,5). It lies in the II quadrant.

(ii) The point is (-5,-3). It lies in the III quadrant.


(iii) The point is (-5,3). It lies in the II quadrant.


(iv) The point is (3,5). It lies in the I quadrant.



Question 6.

In Fig. 3.6, LM is a line parallel to the y-axis at a distance of 3 units.

(i) What are the coordinates of the points P, R and Q?

(ii) What is the difference between the abscissa of the points L and M?



Answer:

(i) The coordinates are:

P(3,2)


R(3,0)


Q(3,-1)


(ii) All the points on the line have the same abscissa i.e.3.


Therefore, difference in abscissa of L and M is 0.



Question 7.

In which quadrant or on which axis each of the following points lie?

(– 3, 5), (4, – 1), (2, 0), (2, 2), (– 3, – 6)


Answer:

(-3,5) lies in the II quadrant.

(4,-1) lies in the IV quadrant.


(2,0) lies on the x-axis.


(2,2) lies in the I quadrant.


(-3,-6) lies in the III quadrant.



Question 8.

Which of the following points lie on y-axis?

A(1, 1), B(1, 0), C(0, 1), D(0, 0), E(0, – 1), F(– 1, 0), G(0, 5), H(– 7, 0), I(3, 3)


Answer:

The points which lie on the y-axis have abscissa=0. Such points are:
C(0,1)

D(0,0)


E(0,-1)


G(0,5)



Question 9.

Plot the points (x, y) given by the following table.

Use scale 1 cm = 0.25 units



Answer:




Question 10.

A point lies on the x-axis at a distance of 7 units from the y-axis. What are its coordinates? What will be the coordinates if it lies on y-axis at a distance of –7 units from x-axis?


Answer:

The point lying on x-axis has ordinate=0.

As it is at distance of 7units,


The coordinates of the point are (7,0).


The point lying on the y-axis has abscissa=0


As it is distance of -7 units from x-axis,


The point is (0,-7).



Question 11.

Find the coordinates of the point

(i) which lies on x and y axes both.

(ii) whose ordinate is – 4 and which lies on y-axis.

(iii) whose abscissa is 5 and which lies on x-axis.


Answer:

(i) The point which lies both on x and y axes is the origin (0,0).

(ii) The point is (0,-4).


(iii) The point is (5,0).



Question 12.

Taking 0.5 cm as 1 unit, plot the following points on the graph paper:

A(1, 3), B(– 3, – 1), C(1, – 4), D(– 2, 3), E(0, – 8), F(1, 0)


Answer:





Exercise 3.4
Question 1.

Points A (5, 3), B (–2, 3) and D (5, –4) are three vertices of a square ABCD. Plot these points on a graph paper and hence find the coordinates of the vertex C.


Answer:


From the graph, coordinates of C are (-2, -4).



Question 2.

Write the coordinates of the vertices of a rectangle whose length and breadth are 5 and 3 units respectively, one vertex at the origin, the longer side lies on the x-axis and one of the vertices lies in the third quadrant.


Answer:


The coordinates of the points of the rectangle are (0, 0), (-5, 0), (-5, -3) and (0, -3).



Question 3.

Plot the points P (1, 0), Q (4, 0) and S (1, 3). Find the coordinates of the point R such that PQRS is a square.


Answer:


From the graph, the coordinates of R are (4, 3).



Question 4.

From the Fig. 3.8, answer the following:



(i) Write the points whose abscissa is 0.

(ii) Write the points whose ordinate is 0.

(iii) Write the points whose abscissa is – 5.


Answer:

(i) The points whose abscissa is 0 lie on the y-axis.

The points are A(0, 3) and L(0, -4).


(ii) The points whose ordinate is 0 lie on the x-axis.


The points are I(-2, 0) and G(5, 0).


(iii) The points whose abscissa is -5 are D(-5, 1) and H(-5, -3).



Question 5.

Plot the points A (1, –1) and B (4, 5)

(i) Draw a line segment joining these points. Write the coordinates of a point on this line segment between the points A and B.

(ii) Extend this line segment and write the coordinates of a point on this line which lies outside the line segment AB.


Answer:

(i)


The points which lie on the line segment AB are C and D.


C(2, 1) and D(3, 3).


(ii)



The points lying on the line outside AB are E and F.


E(0, -3) and F(-1, -5).