a=10cm
b=8cm
h=9cm
P=1/2(a+b)*h
P=1/2*18*9=81cm2
Pkw=81
Pkw=a2
a2=81
a=9cm
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a=10cm
b=8cm
h=9cm
P=1/2(a+b)*h
P=1/2*18*9=81cm2
Pkw=81
Pkw=a2
a2=81
a=9cm