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Ii DeltaPQR, PDbotQR such that D lies on...

Ii `DeltaPQR`, PD`bot`QR such that D lies on QR, if PQ=a,PR=b,QD=c and DR=d, then prove that (a+b)(a-b)=(c+d)(c-d).

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  13. In an equilateral triangle ABC, D is a point on side BC such that B D=...

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  14. Ii DeltaPQR, PDbotQR such that D lies on QR, if PQ=a,PR=b,QD=c and DR=...

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