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p1 = 8 cm
p2 = 6 cm
P = ?
h = ?
jeden bok = 5 cm (20 :4)
połówki przekątnych = 4 cm (8 :2) oraz 3 cm (6 :2)
P= (p1 * p2) /2
P= (8 * 6) /2
P= 24 cm2
P= a * h
P= 5 * h
24 = 5 * h/:5
24 : 5 = h
h = 4.8 cm