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b=75%a dl. podstaw trapezu
h=b dl. wysokosci trapezu
P=(1/2)(a+b)h pole pow. trapezu
b=0,75*12
b=9
h=9
P=(1/2)(12+9)*9
P=(1/2)*21*9
P=94,5 [cm²]
Pole trapezu wynosi 94,5 [cm²]