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P=10*6=60
60=12*B
B=60/12
B=5
a= 10cm
b= 12cm
h₁=6cm
sz:h=?
Rozw:
P=b×h₁
P=12×6
P=72cm²
72=a×h
72=20×h
h=72/10
h=7,2cm²
odp:Druga wysokość wynosi 7,2cm²