Question

A rope is wound 50 times around a cylinder of radius 25cm. How long is the rope​

Answer 1

Circumference of the cylinder :

C = 2 x pi x r

C = 2 x 3.14 x 25 = 157 cm

Multiply the circumference by number of wraps:

157 x 50 = 7,850 cm long ( 78.5 meters)