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b=8cm
C=5cm
H=9cm
Pb= (2x c x H) + (a x H) + (b x H)
Pb= (2x 5cm x 9cm) + (16cm x 9cm) + (8cm x 9cm)
Pb= 90cm + 144cm + 81cm
Pb= 315cm²
h=16+x^2=25
x^2=25-16
x^2=9
x=3
Pp=(a+b)/2*h
Pp=(8+16)/2*3
Pp=24/2*3
Pp=12*3
Pp=36cm^2
Pc=Pp*H
Pc=36*9
Pc=324cm^3
h-wysokość trapezu
^2- do 2 potegi
Pp-pole podstawy
H-wysokość graniastosłupa