The wheel of a motorcycle, 70 cm in diameter makes 40 revolutions in every 10 seconds. What is the speed of the motorcycle in km/hr
30.68 km/hr
31.68 km/hr
32.68 km/hr
33.68 km/hr
Correct Answer : B
How many pieces of 0.85 meteres can be cut from a rod 42.5 meteres long
If the radius of a circle is diminished by 10%, then the area is diminished by:
If the circumference of a circle increases from 4pi to 8 pi, what change occurs in the area ?