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$PQR$ is a triangle in which $PQ = PR$ and $S$ is any point on the side $PQ$. Through $S$, a line is drawn parallel to $QR$ and intersecting $PR$ at $T$. Prove that $PS = PT$.
Given:
$PQR$ is a triangle in which $PQ = PR$ and $S$ is any point on the side $PQ$. Through $S$, a line is drawn parallel to $QR$ and intersecting $PR$ at $T$.
To do:
We have to prove that $PS = PT$.
Solution:
$PQ = PR$
This implies,
$\angle Q = \angle R$
$ST \parallel QR$
This implies,
$\angle S = \angle Q$ (Corresponding angles)
$\angle T = \angle R$ (Corresponding angles)
This implies,
$\angle S = \angle T$
Therefore,
$PS = PT$ (Sides opposite to equal angles are equal)
Hence proved.
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