In the diagram above, RST is a tangent to circle VSU center O ∠SVU = 50° and UV is a diameter. Calculate ∠RSV.
A.
90°
B.
50°
C.
45°
D.
40°
Correct answer is D
< VSU = 90° (angle in a semi-circle)
\(\therefore\) < SUV = 180° - 90° - 50°
= 40°
< RSV = 40° (angle which chord makes tangent = angle in alternate segment)