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UKMT Intermediate Mathematical Challenge, 2025

Geometry Difficulty 2.0 Junior Find the answer United Kingdom

The diagram shows a square $PQST$ and an equilateral triangle $QRS$ . What is the size, in degrees, of angle $PRT$ ?

(A) $10$ (B) $15$ (C) $20$ (D) $25$ (E) $30$

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