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In DeltaPQR is a right angled triangle, ...

In `DeltaPQR` is a right angled triangle, right angled at Q such that QR =-b and `A(DeltaPQR)=a.` If `QNbotPR,` then show that `QN =(2a.b)/(sqrt(b^(2)+4a^(2))).`

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The correct Answer is:
`thereforeQN =(2a.b)/(sqrt(b^(2)+4a^(2))).`
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