Construct an animation displaying a triangle whose vertices travel along three concentric ellipses. |

Construct the conic with five of its tangents given. |

Construct the conic passing through four given points, and tangent to a line through one of the points. |

Construct the conic passing through three given points, and tangent to two lines each through one of the points. |

Construct the conic tangent to four given lines at a point on one of the lines. |

Construct the conic tangent to three given lines at two points on two of the lines. |

Construct the parabola tangent to four given lines |

Construct an animation displaying an ellipse sliding inside a deltoid rigidly. |

Construct the deltoid and the ellipse having three given lines as common tangents. |

Construct an animation displaying a family of trochoids tangent to a fixed deltoid. |

Construct the ellipse tangent to two fixed circles and their external common tangents. |