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Z pola trójkata
p=20*9,6/2=96cm2
p=24*h/2=12* h
Przyrównując:
96=12*h=h=8 cm
24 - 4 =20 cm - ramię
P = ½*a*h
P =½ * 20 * 9,6 = 96 cm²
96 = ½ * 24 * h
96 = 12 * h
96 :12 = h
8 cm = h