Construct a linkage to draw the astroid.
建构一连杆绘制星状线。
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。
Construct an animation showing the inscribed ellipse of an astroid.
建构一动态绘图展示星状线的内切椭圆。
Show how a deltoid of maximal size slides inside a stationary astroid.
在固定不动的星状线内，有一个最大的三角线在其间滚动。
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。
Obviously， a line of astroid nebula is a result which the star old age evolves.
可见，行星状星云是恒星晚年演化的结果。
Construct an animation showing the tangent sweeping out the interior of the 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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