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8 June, 20:26

A circle has a radius of 20 inches. Find the length of the arc intercepted by a central angle of 45°. Leave answers in terms of π.

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  1. 8 June, 21:19
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    central angle/360 = arc length/2pi•r

    Let π = pi

    Let A = length of intercepted arc

    45/360 = A/2 (20) π

    1/8 = A/40π

    8A = 40π

    A = 40π/8

    A = 5π

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