A "three star" geometry problem requiring some prior knowledge in math and proofs to maximize the area of an inscribed triangle in terms of the hypotenuse.

Use your triangle solving skills to solve this triangle problem and then apply it to the real world.

A great geometry problem of area, encorperating many learned skills.

A geometric model that proves the Pythagorean Theorem in a step-by-step diagram that students can advance at their own pace. Requires Java.

Use your right triangle solving skills to solve this ladders in a hole problem.

This is a "three star" geometry problem where prior math problem skills and proof experience is recommended to solve this "Perpendicular Construction" problem.

A geometry proof involving exterior angles of a triangle.

A challenging proof like geometry of finding the square inscribed in a triangle.

This is a "three star" geometry problem where prior knowledge of circles and triangles is recommended to solve this circle in the corner problem.

A problem with equilateral triangles and area to solve this "Shaded Hexagon" problem. Mathematical reasoning and triangle knowledge will be needed to solve the problem.

A problem of finding the fraction of a square that is shaded given criterion. Students will have to use their mathematical reasoning and triangle solving skills to solve this area problem.

Explore and discover the Pythagorean theorem.

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...

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...

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