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hy·po·cy·cloid AHD[hī'pō-sīʹkloid'] D.J.[ˌhaɪpəʊˈsaɪˌklɔɪd]K.K.[ˌhaɪpoˈsaɪˌklɔɪd]n.Mathematics（名词）【数学】 If a equals the radius of a fixed circle and b equals the radius of a smaller rotating circle, the parametric equations of the hypocycloid are: x = (a - b) cosθ + b cos [(a - b)θ]/b y = (a - b) sinθ - b sin[(a - b)θ]/bClarinda/Academy Artworks- The plane locus of a point fixed on a circle that rolls on the inside circumference of a fixed circle.圆内旋转线，内摆圆：在一个固定的圆周内旋转的圆上一点的水平轨迹
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