Geometrymedium · Past Paper
If PQ and PR are two tangents to a circle with center O such that angle QPR = 50 degrees, what is angle QOR?
A50 degrees
B100 degrees
C130 degrees
D150 degrees
✓ Correct Answer: C — 130 degrees
The quadrilateral OQPR has right angles at Q and R. Thus, angle QOR + angle QPR = 180. Angle QOR = 180 - 50 = 130 degrees.
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