One radian is equal to______________?
Correct answer: B. 57.3°
- A. 67.3°
- B. 57.3°
- C. 87.3°
- D. 60°
Explanation
One radian is the angle subtended when the arc length equals the radius, and its degree measure is 180°/π = 57.3°. Therefore, 1 radian is approximately 57.3°. The likely mistake is choosing 60° by using a rough, nonstandard approximation instead of 180°/π.
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About Angular Displacement
Angular displacement measures the change in a body’s angular position and is expressed in radians or degrees, with anticlockwise and clockwise directions assigned signs. It connects to arc length, angular velocity and angular acceleration, and must be distinguished from ordinary linear displacement in rotational motion.
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