alleryThe definitions are extended to any angle using measure in:
ARadians
BDegrees
CMinutes
DSeconds
Answer & Solution
Correct answer: A. Radians
1. Acute angles alone are too limiting.
2. The extension uses arc length on a unit circle.
3. So it works in terms of radian measure.
_Source: syllabus Mathematics, Chapter 3, Trigonometric Functions._
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