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D and E are points on sides AB and AC r...

D and E are points on sides AB and AC respectively of `DeltaA B C`such that`a r\ (D B C)\ =\ a r\ (E B C)`. Prove that `D E\ ||\ B C`.

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RD SHARMA ENGLISH-AREA OF PARALLELOGRAMS AND TRIANGLES-All Questions
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  18. Prove that the area of an equilateral triangle is equal to (sqrt(3))...

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