Calculate 6580

The rotating cone has a height of 20 cm and a radius of 18 cm. Calculate its surface.

Correct answer:

S =  2539.4451 cm

Step-by-step explanation:

h=20 cm r=18 cm  s=h2+r2=202+182=2 181 cm26.9072 cm  S=π r2+π r s=3.1416 182+3.1416 18 26.9072=2539.4451 cm

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