∵ The wheel revolves 360 times in 1 minute,
So, in 60 second there are 360 revolution, then
In 1 Second = 360° / 60 = 6 revolution
Angle make in 1 revolution = 2π radian
then angle make in 6 revolution
= 6 x 2π radian
= 12π radian
Hence, angle make in 1 second by the wheel
= 12π radian
