Oblicz pole rombu o boku 6 cm i kącie rozwartym 120 stopni
P=e x f : 2
P= 6 x 10,5 : 2
P= 63 : 2 = 31,5 cm2
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P=e x f : 2
P= 6 x 10,5 : 2
P= 63 : 2 = 31,5 cm2