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96=1/2*12*h
96=6h//:6
h=16[cm]
a=5 b=7
h=?
1/2(5+7)*h=96
6*h=96 |:6
h=16
Wzór na pole trapezu
P=[(a+b)/2]*h
gdzie mamy dane P=96cm2, a=7cm, b=5cm
Podstawiamy
96=[(7+5)/2]*h
h=96/(12:2)
h=96/6
h=16
Odp; trapez ma wysokość 16cm