Khan Academy Static

With just a compass and a straightedge (or virtual versions of them), you'll be amazed by how many geometric shapes you can construct perfectly. This tutorial gets you started with the building block of how to bisect angle and lines (and how to construct perpendicular bisectors of lines).

4015_Geometric_constructions_perpendicular_line.html

4016_Geometric_constructions_angle_bisector.html

4014_Geometric_constructions_perpendicular_bisector.html