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(see Fig. 6.55). Prove that 2 AB-=2 AC2+...

(see Fig. 6.55). Prove that 2 AB-=2 AC2+ BC. 5. In an equilateral triangle ABC, D is a point on side BC such that BD = BC. Prove that 9 AD2=7 AB? 5. In an equilateral triangle, prove that three times the square of one side is equal to four

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