Mathematics · Geometry

In a triangle PQR, PQ = PR. A point S is taken on PQ such that RS = RQ, and a line ST is drawn parallel to QR meeting PR at T. If the exterior angle &ang;RPU is 140°, then the measure of angle TSR is:

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40°

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In a triangle PQR, PQ = PR. A point S is taken on PQ such that RS = RQ, and a line ST is drawn parallel to QR meeting PR at T. If the exterior angle &ang;RPU is 140&deg;, then the measure of angle TSR is: