This web page shows an easy to follow process for constructing a line tangent to a circle from a given point on the outside of the circle.
Sonoma State University, Dr. Steve Wilson

A helpful scientific calculator that runs in your web browser window.
Holt Online Learning

Worksheet  Construct a triangle given the lengths of all three sides  2 problems
Math Open Reference

Worksheet  Construct a triangle given two sides and the included angle measure (sas)  2 problems
Math Open Reference

A site that goes through general descriptions of angles and the types of angles, but includes additional interactive construction demonstrations.
Hamilton's Math to Build On!

Stepbystep demonstration of how to construct obtuse (greater than 90 degrees) angles.
Math Open Reference

Stepbystep demonstration of how to construct a circle that passes through 3 specific points.
Math Open Reference

Worksheet  Two orthocenter construction problems
Math Open Reference

Worksheet  Construct 306090 triangles using a compass and straightedge
Math Open Reference

Worksheet  Construct a triangle given one side and two adjacent angles  2 problems
Math Open Reference
