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The units used to measure rotation angles are defined to be:
ARadiuses
BRadians
CRations
DRatings
Answer & Solution
Correct answer: B. Radians
1. For one complete revolution the arc length is the circumference.
2. That relationship fixes a natural unit for measuring angle.
3. The units used to measure rotation angles are defined to be radians.
4. Degrees are then a conversion away.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 6 'Uniform Circular Motion and Gravitation', sections 6.1-6.6_
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