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Boa noite. Calculamos por:
At = 2πR² + 2πRH
At = 2πR( R + H)
At = 2*π*15/2 ( 15/2 + 20)
At = 15π/2 ( 55/20)
At = 825π/40
At = 165π/8 dm²
At = 2πR² + 2πRH
At = 2πR( R + H)
At = 2*π*15/2 ( 15/2 + 20)
At = 15π/2 ( 55/20)
At = 825π/40
At = 165π/8 dm²
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