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22 December, 20:21

An arc of length 12 meters is formed by a central angle A on a circle of radius 9. The measure of A in degrees is what? 42.97 1.30 8.38 76.39

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  1. 22 December, 22:44
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    Arc / (2πr) = α/360

    α=360*arc / (2πr)

    α=180*arc / (πr), since arc=12 and r=12

    α=2160 / (9π) °

    α=240/π°

    α≈76.39° (to nearest one-hundredth of a degree)
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