AD ⊥ ABC найдите BC

Question

AD ⊥ ABC
найдите BC

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Answer 1

AD_|_(ABC)
∆DAC; DC=2•AC=8
AD²=64-16=48;AD=4√3
∆BAD ;BD=2•AD=8√3
∆DBC;BC²=8²+(8√3))²=64+3•64=64•4
BC=2•8=16