# CIRCUMFERENCE OF CIRCLE WORD PROBLEMS WORKSHEET

Problem 1 :

On decreasing the radius of the circle by 30%, its area decreased by

a)  30%      b)  60%     c)  75%     d)  None of these

Solution

Problem 2 :

In making 1000 revolutions, a wheel covers 88 km. The diameter of the wheel is

a)  14 m     b)  24 m    c)  28 m     d)  40 m

Solution

Problem 3 :

The diameter of the wheel is 40 cm. How many revolutions will it make an covering 176 m ?

a)  140     b)  150    c) 160     d)  166

Solution

Problem 4 :

The radius of the wheel is 0.25 m. How many revolutions will it take in covering 11 km ?

a)  2800     b)  4000    c) 5500     d)  7000

Solution

Problem 5 :

Find the circumference of a circle of diameter 21 cm

a)  62 cm     b)  64 cm    c) 66 cm     d)  68 cm

Solution

Problem 6 :

Find the area of the circle whose circumference is 52.8 cm

Solution

Problem 7 :

A steel wire when bent in the form of a square, encloses an area 121 sq.cm. The same wire is bent in the form of circle. Find the area of the circle ?

Solution

Problem 8 :

A bicycle wheel makes 5000 revolutions in moving 11 km. Find the diameter of the wheel.

Solution

Problem 9 :

The diameter of the wheels of a bus is 140 cm. How many revolutions per minute must a wheel make in order to move at the speed of 66 km/hr ?

Solution

1)  51% is decreased.

2)  the required radius is 14 m.

3)  the required number of revolutions is 140.

4)   the required number of revolutions is 7000.

5)  the required circumference of the circle is 66 cm.

6)  the required area of the circle is 221.55 cm2.

7)  49 π cm2

8)  the required diameter is 0.7 m

9)  the required number of revolutions is 9.

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