The diameter of the shaft of the well gate is 30 cm. To fill a bucket with water, you need to make 25 turns.

The diameter of the shaft of the well gate is 30 cm. To fill a bucket with water, you need to make 25 turns. To what depth should the bucket be lowered?

First, we need to find the radius of the circle of the gate
30: 2 = 15 cm
According to the formula for the length of a circle 2П * R we find the length of 1 turn
3.14 * 2 * 15 = 94.2
We need to find the depth to which we need to lower the bucket, for this we simply multiply the resulting value by 25
94.2 * 25 = 2355 cm
and we get that the depth of the well is 2355 cm