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abc triunghi dr in A,(bac)=90°,ab=7 cm , ac=24,bc=?

Răspuns :

BC^2 =AB^2+AC^2
BC^2 =7^2+24^2 =49 +576 =625
BC =radical din 625 = 25 cm


T.P. BC la patrat=AB patrat+ AC patrat
BC ^2=7^2+24^2
BC^2=49+576
BC^2=625
BC=25 cm