VTMO 2026 - Grade 7 - Semifinal - SET 5 - Self-study Question 11

Triangle $PQR$ is right-angled and isosceles at $Q$. The segments $QS,TU,VW$ are perpendicular to $PR$, and $ST,UV$ are perpendicular to $QR$, as shown. What fraction of the area of $PQR$ is shaded?