Page 255 - Start Up Mathematics_7

11. Calculate the missing measurements for each trapezium.

Parallel Side 1 Parallel Side 2 Altitude Area
(a) 14 m 20 m 136 m 2
(b) 16 mm 14 mm 154 mm 2

(c) 60 cm 110 cm 1.4 m

12. Find the value of the missing measurements for each rhombus:

(a) diagonal d = 8 cm, diagonal d = 10 cm, area = ____________ cm 2
1
2
(b) Base = 6 m, altitude = _________ m, area = 3,00,000 cm 2
(c) Side = 8 cm, acute angle between one pair of sides = 30°, area = ____________ cm 2

13. Find the area of quadrilateral PQRS as shown in the adjoining figure.

S R
4 cm
12 cm

P 8 cm

Q

14. Show how we can use Fig. (1) to find the area of Fig. (2). Also find the perimeter of each
figure.

5 cm 5 cm
4 cm
11 cm

Fig. 1 Fig. 2

15. In the adjoining figures, a rectangle and a square are given. Find the area of the shaded
portions.

P Q

A 10 cm E B

T
6 cm 20 cm
10 cm
F 10 cm

D 18 cm C S 10 cm U R

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