RD Sharma - Mathematics

Book: RD Sharma - Mathematics

Chapter: 27. Introduction to Graphs

Subject: Maths - Class 8th

Q. No. 5 of Exercise 27.1

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5

Find the coordinates of points P, Q, R and S in Fig. 27.8.


Draw perpendiculars PE, QH, RI and SK from P, Q, C,R and S on the x-axis. Also, draw perpendiculars PF, QG, RJ and SL on the y-axis.
From the figure, we have:
PF = 10 cm and PE= 70 cm
So, the coordinates of vertex P are (10, 70).
Similarly, QG=12 cm and QH= 80 cm
So, the coordinates of vertex Q are (12, 80).
RJ = 16 cm and RI= 100 cm
So, the coordinates of vertex R are (4, 6).
SL = 20 cm and SK= 120 cm
So, the coordinates of vertex S are (5, 3).


Chapter Exercises

Exercise 27.1
Exercise 27.2

More Exercise Questions

1

Plot the points (5,0), (5,1), (5,8). Do thy lie on a line? What is your observation?
2

Plot the points (2,8), (7,8) and (12,8). Join these points in pairs. Do they lie on a line? What do you observe?
3

Locate the points :

(i) (1,1), (1,2), (1,3), (1,4)


(ii) (2,1), (2,2), (2,3), (2,4)


(iii) (1,3), (2,3), (3,3), (4,3)


(iv) (1,4), (2,4), (3,4), (4,4,)
4

Find the coordinates of points A, B, C, D in Fig. 27.7
5

Find the coordinates of points P, Q, R and S in Fig. 27.8.
6

Write the coordinates of each of the vertices of each polygon in Fig. 27.9.
7

Decide which of the following statements is true and which is false. Give reasons for your answer.

(i) A point whose x-coordinate is zero, will lie on the y-axis.


(ii) A point whose y-coordinate is zero, will lie on x-axis.


(iii) The coordinates of the origin are (0,0).


(iv) Points whose x and y coordinates are equal, lie on a line passing through the origin.

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