The angle subtended at the center of a circle by an arc equal to its radius is equal to:
Correct answer: A. One radian
- A. One radian
- B. One rotation
- C. One degree
- D. Half rotation
Explanation
The angle subtended at the center of a circle by an arc equal to its radius is defined as one radian. In a circle, there are 2π radians in a full revolution, and since the circumference of a circle is 2π times the radius, an arc equal to the radius subtends an angle of one radian at the center.
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