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?

Correct result:

D =  2 cm

Solution:

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

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