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trójkąt:
a = 6
h = 1
P = 1 * 6 : 2 = 3 j²
trapez:
a = 8
b = 6
h = 3
P = (8 + 6) * 3 : 2 = 14 * 3 : 2 = 42 : 2 = 21 j²
Pc = 3 + 3 + 21 + 21 = 6 + 42 = 48 j²