Subjects geometry

Angle Bisector D1423B

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1. **Problem statement:** In triangle PQR, angles R and Q are bisected by lines RU and QS respectively. Given that angle P = 50° and angle TRS = 32°, find the measure of angle QTU. 2. **Recall angle sum property:** The sum of interior angles in any triangle is 180°. So, $$\angle P + \angle Q + \angle R = 180^\circ$$ Given \(\angle P = 50^\circ\), we have $$\angle Q + \angle R = 180^\circ - 50^\circ = 130^\circ$$ 3. **Angle bisectors:** Since RU bisects \(\angle R\), it divides \(\angle R\) into two equal parts: $$\angle URQ = \angle URP = \frac{\angle R}{2}$$ Similarly, QS bisects \(\angle Q\), so $$\angle PQS = \angle SQR = \frac{\angle Q}{2}$$ 4. **Identify angles at point T:** Point T is the intersection of RU and QS inside the triangle. 5. **Use the given angle \(\angle TRS = 32^\circ\):** This angle is formed at R by points T and S. 6. **Key insight:** Since S lies on PR and QS bisects \(\angle Q\), and U lies on PQ with RU bisecting \(\angle R\), the quadrilateral formed by points Q, T, U, and S has properties related to these bisectors. 7. **Calculate \(\angle QTU\):** By properties of angle bisectors and intersecting chords inside the triangle, the measure of \(\angle QTU\) equals \(90^\circ - \frac{\angle P}{2} - \angle TRS\). 8. **Compute:** $$\angle QTU = 90^\circ - \frac{50^\circ}{2} - 32^\circ = 90^\circ - 25^\circ - 32^\circ = 33^\circ$$ **Final answer:** $$\boxed{33^\circ}$$