AB is a diameter of a circle and C is a point on the circumference. Angle . Find angle .
Answer and explanation
Correct answer: A.
- Step 1: The angle in a semicircle is , so angle .
- Step 2: Angles in a triangle sum to : .
Answer
.
Why not the others: : this is the given angle BAC. : this is . : this is angle ACB.
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