Trig

A pendulum swings through an angle of 22 degrees each second. If the pendulum is 30 inches long, how far does its tip move each second?

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  1. We need to find the arclength of a central angle of 22°

    let's use a ratio
    arc/(2π(30)) = 22/360
    arc = 22(60π)/360 = appr 11.5 inches/sec

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