alleryAn angle of one radian is subtended at the centre by an arc of length:
AOne tenth
BOne third
COne eighth
DOne unit
Answer & Solution
Correct answer: D. One unit
1. The definition uses a circle of radius one.
2. The arc has the same length as that radius.
3. The angle subtended at the centre by an arc of length 1 unit in a unit circle is 1 radian.
4. So the answer is one unit.
_Source: syllabus Mathematics, Ch 3 'Trigonometric Functions'_
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