(1) Construct a linkage to draw the astroid.

(2) Wouk kind of virus gastroenteritis astroid virulent gastroenteritis.

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

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

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

(6) Construct an animation of three concurrent tangents of the astroid.

(7) Show how a deltoid of maximal size slides inside a stationary astroid.