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Let $\text{R}$ be the radius of the circle. What is the angle subtended by an arc of length $\text{R}$ at the center of the circle?

  1. $1$ degree    
  2. $1$ radian  
  3. $90$ degrees
  4. $\pi$ radians
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Answer :  1 radian or 57.3 degrees

The question represents 1 radian. 

One radian is the angle of an arc created by wrapping the radius of a circle around its circumference. (http://www.teacherschoice.com.au/maths_library/angles/angles.htm)

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