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Triunghi ABC (mA ) = 90 grade BC = 26 cm Cosinus C = 12 Supra 13 Aflati Perimetrul ABC :D Help :D :))

Răspuns :

cosC=AC/BC   AC/26=12/13  AC=26*12/13=24cm  BC²=AC²+AB²
AB²=26²-24²=676-576=100  AB=√100=10CM  P=10+24+26=60CM