Here are the calculations for the angles:
1.2.1 Calculate WRS
Step 1: Identify the relationship between the tangent and diameter.
RW is a tangent to the circle at R, and RS is the diameter. The angle between a tangent and a diameter at the point of contact is 90∘.
∠WRS=90∘
The size of WRS is ∗90∘∗
1.2.2 Calculate W
Step 1: Identify angles using the tangent-chord theorem and angle in a semicircle.
RW is a tangent and RT is a chord, so ∠WRT=∠RST (tangent-chord theorem).