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:

S1=69.08 cm2 S2=62.8 cm2  2S3 = S1  S2 = 2 π r2  r=2πS1S2=2 3.141669.0862.80.9997 cm  D=2 r=2 0.9997=2 cm



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