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Question

PSSQ = PTTR and PST = PRQ. Prove that Δ PQR is an isosceles triangle.

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Solution

It is given that PSSQ = PTTR

So, ST || QR (Theorem)

PST = PQR (Corresponding angles) (1)

Also, it is given that

PST = PRQ (2)

So, PRQ = PQR [From (1) and (2)]

PQ = PR (Sides opposite the equal angles)

i.e., PQR is an isosceles triangle.


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