If the mine winch drum diameter is 6cm,calculate how far the cage will drop for each single rotation of the drum ,use formula C=nr

Answer 1

see the similar questions below.
But you have the formula -- use it, after you correct it.
C = πd = 2πr

Answer 2

R = d/2 = 3 cm
drops 1 circumference in 1 revolution
C = 2 pi R = 2 * 3.14 * 3 = 18.8 cm

by the way of course C = pi D = 2 pi R