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P = 0,5 x a x h = 0,5 x 6 x 3 = 9
Pole 1 z podstawą BC.
P = 0,5 x|BC| x h²
9 = 0,5 x|BC| x h²
9 = 0,5 x 4,5 x h²
h² = 4
h = 2