16. Find the area of the circle, length of whose
circumference is equal to the sum of the
lengths of the circumferences of circles with
radii 15 cm and 13 cm.
17. A piece of wire of length 108 cm is bent to form
a semicircular are bounded by its diameter.
Find its radius and enclosed area.
2R
2
+ d = 108
Enclosed area =
is bent to form a circle, find the area of the circle.
The radius of a circular wheel is 42 cm. Find
the distance travelled by it in:
10 1 revolution
(i) 50 revolutions
() 200 revolutions
The distance travelled by a wheel in one
revolution is equal to its circumference,
13 The diameter of the wheel of a car is 0.70 m.
Find the distance covered by it in 500
revolutions
Il the wheel takes 5 minutes to make 500
revolutions; find its speed in :
(0 m/s
(ii) km/hr
14. A bicycle wheel, diameter 56 cm, is making
45 revolutions in every 10 seconds. Calculate
the speed, in kilometre per hour, of the
bicycle.
15. A roller has a diameter of 1.4 m. Find :
0 its circumference
(i) the number of revolutions it makes while
travelling 61.6 m
0
da 21
2
18. In the following figure, a rectangle ABCD
encloses three circles. If BC = 14 cm, find the
area of the shaded portion. (Tako r = 3
D
С
B
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