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Pp=a²
Pp=5²=25cm²
Pb=4*(a*h)/2
d=5√2
(2,5√2)²+2²=x²
12,5+4=x²
16,5=x²
x≈4
h²+2,5²=4²
h²+6,25=16
h²=9,75
h≈3
Pb=4*(5*3)/2=4*7,5=30cm²
Pc=25+30=55cm²
V=⅓Pp*H
V=8*2=16cm³