alleryAn angle is a measure of rotation of a ray about its:
AInitial point
BInterior point
CInverted point
DIsolated point
Answer & Solution
Correct answer: A. Initial point
1. A ray turns about one fixed end.
2. That end stays put while the ray sweeps.
3. Angle is a measure of rotation of a given ray about its initial point.
4. So the answer is its initial point.
_Source: syllabus Mathematics, Ch 3 'Trigonometric Functions'_
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