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The radian definition uses a circle of which radius?

AOne unit
BTwo units
CFour units
DNine units
Answer & Solution
Correct answer: A. One unit
1. The circle used is called the unit circle. 2. Its name states its radius. 3. A unit circle is a circle of radius 1 unit. 4. So the answer is one unit. _Source: syllabus Mathematics, Ch 3 'Trigonometric Functions'_
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