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OpenStudy (anonymous):
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
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OpenStudy (anonymous):
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.
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