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In the figure below, PQR is the tangent to the circle at Q. TS is a diameter and TSR and QUV are straight lines. QS is parallel to TV. Angle SQR=#40^0# and angle TQV=#55^0#. Find the following angles, giving reasons for each answer:
(a) QTS
(b) QRS
(c) QVT
(d) UTV