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In the adjoining figure, DeltaPQR is an ...

In the adjoining figure, `DeltaPQR` is an equilateral triangle. Point S is on seg QR. such that `QS=(1)/(3)QR.` Prove that : `9PS^(2)=7PQ^(2).`

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`therefore9PS^(2)=7PQ^(2)`
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