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geometry

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Two chords intersect a circle. The shorter chord is divided into segments of lengths of 9 inches and 12 inches. The longer chord has a length of 24 inches. Find the length of the shorter portion of the longer chord .

  • geometry -

    make a sketch
    angles subtended by the same chord are equal,
    so you have two similar triangles
    let the 24 inch chord be divided into x and 24-x
    then by ratios ...
    x/12 = 9/24-x
    108 = 24x - x^2
    x^2 - 24x + 108 = 0
    (x-6)(x-18)=0
    x = 6 or 18

    if one piece is 6, the other is 24-6 = 18

    the shorter piece is 6

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