1.

If D is the mid-point of the side BC of triangle ABC and AD is perpendicular to AC, then

Answer»

` B^(2)= a^(2) - c^(2) `
` a^(2) + b^(2) + 5c^(2) `
` 3a^(2) +3C^(2)=b^(2) `
` 3b^(2) =a^(2) -c^(2)`

Answer :D


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