h=1,5dm=15cm
a=20cm
b=1/5·20cm=4cm
P=1/2(a+b)·h
P=1/2·(20cm+4cm)·15cm
P=1/2·24cm·15cm
P=180cm²
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h=1,5dm=15cm
a=20cm
b=1/5·20cm=4cm
P=1/2(a+b)·h
P=1/2·(20cm+4cm)·15cm
P=1/2·24cm·15cm
P=180cm²