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An angle is defined as a measure of the rotation of a:
ARay
BRim
CRod
DRib
Answer & Solution
Correct answer: A. Ray
1. The rotation happens about a point.
2. That point is the initial point of the line.
3. It is the rotation of a given ray.
_Source: NCERT Class 11 Mathematics, Ch 3 'Trigonometric Functions'_
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