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Grand Canyon University
Find the radius r of a circle with an arc length $s$ and a central angle $\theta$ Central Angle $\theta$ $\frac{\pi}{2}$ radians $\frac{4 \pi}{3}$ radians $135^{\circ}$ $330^{\circ}$ Arc Length $s$ 3 meters Dr. J's Maths.com Trigonometry - Arc lengths and sectors.
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