Berapakah panjang sisi BC ?

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Berapakah panjang sisi BC ?

Berapakah panjang sisi BC ?

perhatikan ∆ADC

AC^2 = AD^2+AC^2 \ AC^2 = {9}^{2} + {12}^{2} \ AC^2 =81 + 144 \ AC^2 =225

perhatikan ∆ACB

AC^2+BC^2 = AB^2 \ 225 + BC^2 = {20}^{2} \ BC^2 = 400 - 225 \ BC^2 = 175 \ BC = sqrt{175} \ BC = sqrt{25 times 7} \ BC =5 sqrt{7}