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:

2πr2=S1−S2 2πr2=69.08−62.8 r2=0.9995 r=0.9997 D=2r=2 cm

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