A circle has a circumference of 20. It has an arc of length 4. What is the central angle of the arc, in degrees?
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If you've had the equation L = C(θ/360) then you can solve for theta.
4 = 20 ( θ/360)
θ = 4(360)/20 = 72°
4 = 20 ( θ/360)
θ = 4(360)/20 = 72°
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