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Pole prostokąta:
P1 = 2 * 6 = 12 j²
Pole trójkąta:
P2 =1/2 * 6 * 6 = 18 j²
Pole figury:
P=P1+P2 = 12 + 18 = 30 j²
b = 8
h = 6
P = (2 + 8) * 6 : 2 = 10 * 6 : 2
P = 60 : 2 = 30 j²