# Rotary cylinder

The rotating cylinder has a surface area 69.08 cm2. The area of the shell is 62.8 cm 2. What is the diameter of the cylinder?

Result

D =  2 cm

#### Solution:

$2\pi r^2 = S_1 - S_2 \ \\ 2\pi r^2 = 69.08-62.8 \ \\ r^2 = 0.9995 \ \\ r = 0.9997 \ \\ D = 2r = 2 \ \text{ cm }$

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