A volmeter's pointer is 6 centimeters in length. Find an angle through which it rotates when it moves 2.5 centimeters on the scale.

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  1. The circumference is 2pi(6) or 12pi

    let the angle be ߺ and set up a ratio

    360/(12pi)= ß/2.5
    ß = 2.5(360)/(12pi)
    = 23.9º

    or if α is the angle in radians

    2pi/(12pi) = α/2.5
    α = .417 radians

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