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Demonstrations 41  60 of 115
The Ellipsograph, a Mechanism for Constructing an Ellipse
Dandelin Spheres for an Ellipse
Area under a Parabola by Symmetries
The Parabola's Evil Twin: Real and Nonreal Roots of a Real Quadratic
Tangents to a Rotating Ellipse
Projecting the Tangent Point of an Ellipse
Constructing Quadratic Curves
Focus and Directrix in a Quadratic Bézier Curve
Tracing a Line Segment Moving along an Ellipse
Cissoid of Diocles
Connecting Skew Axles with Hyperboloidal Gears
Rolling One Parabola on Another
Maximizing the Volume of a Right Circular Cone with Given Slant Length
Perpendicular Bisector Trace of a Parametric Function
Parabola as a Locus of Centers of Circles
Multiple Planes through Surfaces
Hyperbolic Paraboloid as a Ruled Surface
Dynamic Billiards in Ellipse
Cross Sections of Quadratic Surfaces
Hyperbolas, Lemniscates, and Cassini Ovals Generated by w = Sqrt(z)
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