Use your knowledge of exterior angles of a triangle to prove the theorem.

[Free Registration/Login may be required to access all resource tools.] This concept teaches students how to find the distance between two points using the distance formula. Students examine guided notes, review guided practice, watch...

[Free Registration/Login may be required to access all resource tools.] In this lesson students use the Distance Formula to find the distance between two points. Students examine guided notes, review guided practice, watch instructional...

[Free Registration/Login may be required to access all resource tools.] In this lesson students find the distance between two parallel lines. Students examine guided notes, review guided practice, watch instructional videos and attempt...

[Free Registration/Login may be required to access all resource tools.] This concept teaches students the relationship between opposite angles and sides in triangles and how to use this relationship to compare triangles. students examine...

Learn how similar triangles have congruent corresponding angles and proportional corresponding sides.

Explore some problems you can solve with your knowledge of triangles and trigonometry.

Learn how the Law of Cosines uses the measure of angle C to provide an equation that relates the three sides of the triangle with angle C.

Students use the Cabri Geometry II Plus software to investigate the relationship between angle and ratio in a right triangle.

This site provides you with a table of contents about spheres. It links to topics such as basic information about spheres, area of the sphere, and Girard's Theorem.

A wealth of resources for teachers introducing locus theorems to students. Lessons cover simple definitions, provide examples and diagrams, and offer connections to real-life situations. Practice exercises offer students online quizzes...

[Free Registration/Login Required] This flipchart is a lesson on the Pythagorean Theorem. This has just about everything you need to teach the concept including, video, practice, and Activote assessment. In addition, there are two other...

[Free Registration/Login Required] This flipchart is a Pythagorean Quiz. This quiz goes with Pythagorean Theorem Lesson. There is also a flowchart that goes with this lesson.

Explains the basic concept of perpendicular lines with step-by-step instructions and methods for solving specific problems on your own relating to this topic.

Explains the basic concept of isosceles triangles with step-by-step instructions and methods for solving specific problems on your own relating to this topic.

Explains the basic concept of intersecting lines and angles with step-by-step instructions and methods for solving specific problems on your own relating to this topic.

This tutorial discusses triangle inequality and provides practice problems for students to try out their skills. The teacher resource page contains a lesson plan for a yummy activity involving licorice.

Explains the basic concept of right triangles with step-by-step instructions and methods for solving specific problems on your own relating to this topic.

Provided are definitions of arcs in circles, an example and theorems to assist with test preparation.

Contains over five hundred Geometry articles, problems, puzzles, and games. Some sites relating to circles are provided within this list.

[Free Registration/Login may be required to access all resource tools.] Apply the Tangent Secant Segment Theorem.

[Free Registration/Login may be required to access all resource tools.] Apply the Two Secants Segments Theorem.

Use theorems to prove ideas of inscribed and central angles in circles.

Use theorems to prove inscribed angles in circles.