Geometrymedium · Past Paper
In the figure, O is the center and AB is a diameter. C is a point on the circle such that angle ABC = 30 degrees. Find angle BAC.
A30 degrees
B60 degrees
C90 degrees
D120 degrees
✓ Correct Answer: B — 60 degrees
Angle ACB = 90 (semi-circle). BAC = 180 - 90 - 30 = 60 degrees.
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