| Construct an animation showing the inscribed ellipse of an astroid. |
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| Construct an animation showing the tangent sweeping out the interior of the astroid. |
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| Construct an animation showing the inscribed ellipse of an astroid. |
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| Construct an animation showing the tangent sweeping out the interior of the astroid. |
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| Two verttices of a rigid triangle slide along two perpendicular lines; what does the third vertex describe? |
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| Show that it is possible for a triangle move rigidly with vertices traveling along three ellipses of different sizes and axes. |
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