An inscribed angle in a circle subtends a diameter. What is its measure?
Answer and explanation
Correct answer: C. 90°
- Step 1: Thales' theorem states the angle in a semicircle is a right angle. Step 2. The angle equals half the central angle 180°, so 90°. Answer: 90°. Why not the others: 180° is the central angle, not the inscribed angle.
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