Rotating cone II

Calculate the area of the surface of a rotating cone with base radius r=15 cm and height h=13 cm.

Correct answer:

S =  16.42 dm2

Step-by-step explanation:

r=15 cm h=13 cm  s=h2+r2=132+152=394 cm19.8494 cm  S1=π r2=3.1416 152706.8583 cm2 S2=π r s=3.1416 15 19.8494935.3825 cm2  S0=S1+S2=706.8583+935.38251642.2409 cm2  S=S0 dm2=S0:100  dm2=1642.2409:100  dm2=16.42 dm2=16.42 dm2

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