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a=12cm
h₁=5cm
p=12×5=60cm²
b=
h²=4cm
p=bh₂
60=4b
b=60:4
b=15cm= szukany bok
a₁=12cm
P=a*h
P=12cm*5cm
P=60cm²
h₂=4cm
P=60cm²
a₂=?
P=a*h
60cm²=a₂*4cm
4a₂=60cm²/:4
a₂=15cm
odp.drugi bok ma długość 15cm