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1/2 * a * h = P
1/2 * 4 * 12 = P
2 * 12 = P
P = 24 cm kwadratowych
Pole trójkąta wynosi 24 cm kwadratowych
h=3a
h=12cm
a=12:3=4cm
P=4cm*12cm/2=24cm/2=12cm2