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b=2*6cm=12cm
h=0,75*12cm=9cm
p=(a+b)*h/2=(12+6)*9/2=18*9/2=9*9=81
Odp: pole trapezu wynosi 81cm^2
b=6*2=12 cm
h=3/4*12=9 cm
P=(a+b)*h/2
P=(6+12)*9/2
P=18*9/2
P=81 cm²
P=1/2(a+b)h
P=1/2(12+6)9=81cm kwadratowych