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a=5
b=17
h =8
H =20
Szukane
V=?
Pc=?
8²+6²=x²
64+36=x²
100=x²
x=10
Pc=2×Pp+Pb
Pp=a+b/2×h=5+17/2×8=88
Pb=2×10×20+5×20+17×20=400+100+340=840
Pc=2×88+840=176+840=1016 [j²]
V=Pp×H
V=88×20=1760 [j³]