The diagram below a circle, centre O. PQ is a tangent to the circle at Q and PTOR is a straight line. QRST is a cyclic quadrilateral in which angle RTS = 350 and RT and QS are diameters. Giving reasons for your answer, find the size of:
![Mathf4et121p1qn24](https://www.easyelimu.com/images/form_4_past_papers/Form4_EndTerm1_2021/Maths_Paper1_Paper2/Mathf4et121p1qn24.PNG)
- Acute angle ROS.
- Angle RQS.
- Angle PQR.
- Angle QPT.
- Angle PQT.