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Mathematics, 30.10.2019 03:31 goodluck99

Acircle has a radius 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 arc?
a 2pi radians
b. 2 pi r radians
c. 2r radians
d. 2 radians

plz ! and explain

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