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In Figure -6 , in an equilateral triangl...

In Figure -6 , in an equilateral triangle ABC, AD is perpendicular to BC , BE is perpendicular to AC and CF is perpendicular to AB . Prove that `4 (AD^2 +BE^2 +CF^2)=9AB^2`

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X BOARDS-CBSE BOARDS 2020-SECTION D
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