1. AB2 + CD2 = AD2 + BC2
  2. CD2 + BD2 = 2AD2
  3. AB2 + AC2 = 2AD2
  4. AB2 = AD2 + BC2
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1 Answers

Answer: Option 1

According to question, In ΔABC AB2 = AC2 + BC2 . . . . . . . (i) ΔACD AD2 = AC2 + CD2 AC2 = AD2 - CD2 . . . . . . . (ii) Put the value of AC2 in equation (i) AB2 = AD2 - CD2 + BC2 AB2 + CD2 = AD2 + BC2

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