Oblicz pole trójkąta. a) 7,2 cm 6,75 cm 8 cm b) 16 cm 94 12 cm 20 cm c) 5 cm 11 cm 9 cm
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Odpowiedź:
a) 1/2 * 6,75 * 7,2 = 24,3cm2
b) 1/2 * 12 * 16 = 96cm2
c) 1/2 * 5 * 9 = 22,5cm2