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P=1/2 *12 * 3,5 = 1/2 * 42 = 21 cm2
Odp: Trapez ma wysokość równą 3,5 cm
8,3 +3,7 = 12
12*h/2 = 21cm2
12*3,5 = 42
12*3,5 / 2
h=3,5