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Pp:
a²√2
-------
2
V:
Pp * H = [(a²√2)*a] :2
= a³√2 na 2
Pb:
2*a*a+a*a√2 = 2a²+a²√2
Pc:
2*Pp+Pb= 2*a³√2 na 2 + 2a²+a²√2=
= a³√2+2a²+a²√2