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A full revolution of the initial side subtends an angle of:
AOne pi radian
BFour pi radians
CHalf pi radian
DTwo pi radians
Answer & Solution
Correct answer: D. Two pi radians
1. The circumference of a unit circle is two pi.
2. One revolution sweeps the whole circumference.
3. So it subtends two pi radians.
_Source: NCERT Class 11 Mathematics, Chapter 3, Trigonometric Functions._
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