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Pins and string
Author:
Malin Christersson
To answer a Tumblr question: Curve drawn by using three pins and a string. The curve is piecewise defined by six elliptical arcs. Move the dots to see another shape!
GeoGebra
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van Aubel's Theorem
Witch of Agnesi - A Classical Construction
Ellipse, Hyperbola and Circle as Envelopes
Construct a Square
Play C3 E3 G3 C4_C4
Discover Resources
Mediatriz
Art Project
Golden ratio in pentagons
Parallelogram? Why So? (GoGeometry Action 77)
Modeling a 2-Piece Flower Pot in GeoGebra Augmented Reality
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Logic
Ellipse
General Quadrilateral
Coordinates
Rotation