In the given figure, PS/SQ = PT/TR and ∠ PST = ∠ PRQ . Prove that △ PQR is an isosceles triangle.

CBSE Class 10 Maths PYQ · Triangles · Similarity with Triangles · 2 Marks · March 2025 · Standard

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852 Marks · March 2025 · Standard
In the given figure, $\frac{PS}{SQ} = \frac{PT}{TR}$ and $\angle PST = \angle PRQ$. Prove that $\triangle PQR$ is an isosceles triangle.
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Given $\frac{PS}{SQ} = \frac{PT}{TR}$
$\Rightarrow ST || QR$ ($1$)
$\therefore \angle PST = \angle PQR$ ($1/2$)
and given, $\angle PST = \angle PRQ$
So, $\angle PQR = \angle PRQ$
$\therefore \triangle PQR$ is an isosceles triangle. ($1/2$)
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