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: Option D
Explanation
< VSU = 90° (angle in a semi-circle)
(therefore) < SUV = 180° – 90° – 50°
= 40°
< RSV = 40° (angle which chord makes tangent = angle in alternate segment)