A circle has a rdius of length r. If you mark off an arc on the circle of length 2r, what is the measurement of the angle that subtends the axis?

A. 2pi r radians
B. 2 pi radian
C. 2 radians
D. 2r radians

Question

A circle has a rdius of length r. If you mark off an arc on the circle of length 2r, what is the measurement of the angle that subtends the axis?

A. 2pi r  radians
B. 2 pi radian 
C. 2 radians 
D. 2r radians

anonymous · Answer

this is the definition of what a radian measure is....
so if the arc hads lenght 2r, the measure of the angle is 2 radians.