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28 March, 10:18

In a circle, an arc has an arc length of 4π. If the arc measure is 80°, what is the length of the radius of the circle?

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  1. 28 March, 13:18
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    9 units.

    Step-by-step explanation:

    Arc length = r C where r = radius and C is the arc measure in radians.

    Arc measure = 80 * π/180 radians. So:

    4π = r * 80π/180

    4 = 80r / 180

    80r = 4 * 180

    r = 720 / 80

    r = 9.
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