The perimeter of a square of side 11 cm is equal to circumference of a circle; then the diameter of the circle is :

1. 7 cm

2. 7.5 cm

3. 14 cm

4. 3.5 cm

The circumference of a circle is equal to the sum of the circumferences of two circles with radii 10 cm and 12 cm. The radius of the circle formed is :

1. 2 cm

2. 44 cm

3. 22 cm

4. 244 cm

A circular wheel of radius 3.5 cm makes 600 rounds in 48 seconds, its speed is :

1. 275 cm/s

2. 27.5 m/s

3. 550 cm/s

4. 55 cm/s

Find the radius and area of a circle, whose circumference is :

(i) 132 cm

(ii) 22 m