The radius of a circular wheel is 42 cm. Find the distance traveled by it in :

(i) 1 revolution

(ii) 50 revolutions

(iii) 200 revolutions

The diameter of wheel is 0.70 m. Find the distance covered by it in 500 revolutions.

If the wheel takes 5 minutes to make 500 revolutions; find its speed in :

(i) m/s

(ii) km/hr

A roller has a diameter of 1.4 m. Find :

(i) its circumference

(ii) the number of revolutions it makes while traveling 61.6 m.

Find the area of the circle, length of whose circumference is equal to the sum of the lengths of the circumferences with radii 15 cm and 13 cm.