Respostas

2013-12-05T00:24:41-02:00
Area total  = C*h + 2*b
C = comprimento 
b = base
h = altura
C = 2.π.r = 20.π cm
h = 20 cm
b = π.r² = 100.π
A = 20.π.20 + 2.100.π
A = 400π + 200π = 600π