Five mark exercise problem VII — task. Mathematics State Board, Class 10.

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The perpendicular

$PS$ on the base

$QR$ of a

$\Delta PQR$ intersects

$QR$ at

$S$ , such that

$QS$

$=$

$3$

$SR$ . Prove that

$2$

$PQ^2 = 2PR^2 + QR^2$ .

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16. Five mark exercise problem VII