A geometric proof. Prove two angles in this model are equal in measure.

A geometry proof involving exterior angles of a triangle.

Learn about how the Pythagorean Theorem works through investigating the standard geometric proof.

A discussion of Christian Huygens' contribution to wave optics, and particularly to our understanding of the reflection and refraction of light. Excellent diagrams and a geometric proof on why the law of reflection is mathematically...

A geometry proof problem involving a right triangle and finding angles of equal measure.

A "three star geometry problem" - requiring the knowledge of biconditional statements and how to prove such problems.

Discovering the properties of constructions, seeing proofs in action, and viewing problems come to life here with this wonderful use of technology in the classroom. Single steps are explained and illustrated one at a time so that the...

This is a lesson plan of paper folding as a method of proof. A Java applet version of the activity can be accessed, giving the actual lengths and angle sizes.

MathWorld provides the definition of a rectangle and the area formula of a rectangle.

You have been asked to place a warehouse so that it is an equal distance from three roads on a map. Learners must fold a paper so that this point is where two folds intersect, and they must explain why their construction works and why...