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P = 1/2 * 4√3 * 9 * sin150°
sin150° = sin(180°-30°) = sin30° = 1/2
P = 1/2 * 4√3 * 9 * 1/2
P = 36√3 * 1/4
P = 9√3 j.
Odp. Pole trójkąta wynosi 9√3 j. odp. A