Construct an animation showing the tangent sweeping out the interior of astroid.

建构一动态绘图:展示星状线的切线所有扫掠过的内部轨迹.

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Construct rotating cardioid and astroid while remaining orthogonal to each other.

作旋转的心脏线和旋转的星状线,且彼此维持正交.

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Construct an animation of three concurrent tangents of the astroid.

建构一动态绘图:展示星状线共点的三切线.

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Construct a linkage to draw the astroid.

建构一连杆绘制星状线.

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Construct an animation displaying an astroid sliding along three fixed concurrent lines meeting at 120 degrees.

建构一动态绘图:展示星状线的滚动,沿著共点及间隔120度的三切线.

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