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19 May, 16:24

The beam of a lighthouse is visible for a distance of 15 mi. To the nearest square mile, what is the area covered by the beam as it sweeps in an arc of 270°?

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  1. 19 May, 17:15
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    area of circle = pi x r^2

    using 3.14 for pi

    area = 3.14 x 15^2 = 706.5 square miles

    270/360 = 0.75

    706.5 * 0.75 = 529.875

    rounded to nearest mile = 530 miles
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