Questão : http://imageshack.us/a/img850/5116/85632654.png
P1 = 3*4 = 12 cm
P2 = 3*2 = 6 cm
P3 = 3*1 = 3 cm
P1 + P2 + P3 = 12 + 6 + 3 = 21 cm
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Verified answer
P1 = 3*4 = 12 cm
P2 = 3*2 = 6 cm
P3 = 3*1 = 3 cm
P1 + P2 + P3 = 12 + 6 + 3 = 21 cm
pronto