Rotary cylinder

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

Correct answer:

D =  2 cm

Step-by-step explanation:

2πr2=S1S2 2πr2=69.0862.8 r2=0.9995 r=0.9997 D=2r=2 cm

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