astroid

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

建構一動態繪圖:展示星狀線的切線所有掃掠過的內部軌跡.

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

作旋轉的心臟線和旋轉的星狀線,且彼此維持正交.

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Construct an animation of three concurrent tangents of the astroid.

建構一動態繪圖:展示星狀線共點的三切線.

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Construct a linkage to draw the astroid.

建構一連桿繪制星狀線.

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

建構一動態繪圖:展示星狀線的滾動,沿著共點及間隔120度的三切線.

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