Find the radian measure of angle θ, if θ is a central angle in a circle of radius r, and θ cuts off an arc of length s. ​  r = 4 inches, s = 8 inches

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Find the radian measure of angle θ, if θ is a central angle in a circle of radius r, and θ cuts off an arc of length s.

​ 

r = 4 inches, s = 8 inches

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