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P1 = 0,5 * 4 * 6 = 12
P2 = 0,5 * 3 * 8 = 12
P3 = 0,5 * 2 * 7 = 7
P1 + P2 + P3 = 31
Pole prostkąta
P = 8 * 7 = 56
Pole trójkąta dużego:
56 - 31 = 25