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a=10cm, h=5cm
P=axh
P=50cm²
a1=? , h1= 10cm
a1=P:h1=100:10=10cm
Drugi bok wynosi 10cm
Jeżeli boki nie są równoległe to:
a=10cm, h=10cm
P=axh
P=100cm²
a1=? , h1= 5cm
a1=P:h1=100:5=20cm
Drugi bok ma wtedy 20cm