Constructions
These entries demonstrate Euclidean constructions - where we draw geometric shapes using only a compass and straightedge. No measurement of length (with a ruler) or angles (with a protractor) is allowed.
Lines
Angles
Triangles
Triangle Centers
Circles, Arcs, Ellipses
Other Constructions
The entries below are not classical Euclidean constructions using compass and straightedge, but are included anyway because they can be useful and practical.