Uma fábrica confecciona sacos de confeitar de papel-manteiga para decoração de bolos no formato de um cone circular reto sem tampa cujas medidas estão indicadas no desenho abaixo. 20 cm e 16 cm
De acordo com essas medidas e usando pi=3,14, quantos cm2 de papel-manteiga serão necessários para fabricar 25 sacos de confeitar?
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