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Question

In the fig. 3.3 seg PS is median of PQR and seg PSseg QR prove that PQR is isosceles triangle.

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Solution

Given : PS is the medianQS = QRseg PSseg QRIn PSQ and PSR,seg PS =seg PS (common)PSQ = PSR = 90° (given)seg QS = seg SR (given)PSQ PSR (by SAS congruency test)Thus, seg PQ = seg PR ( by c.s.c.t)So, PQR is an isosceles triangle.

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