Teacher Resources for Instructional Planning


Geometry Std 8: Deduce relationships between two triangles, including proving congruence or similarity of the triangles from given information, using the relationships to solve problems and to establish other relationships.

Lesson Plans Triangle Congruence Problems Here are examples of several triangle proofs with an online quiz. Congruent Right Triangles Here are examples of several right triangle proofs with an online quiz. Triangle Congruence Theorems These are GSP applets that demonstrate all the triangle congruence theorems and the triangle inequality theorem.

Resources: Thinkquest This is a great resource for triangle proofs. It covers all of the major theorems. Congruent Triangles This interactive applet demonstrates a surprising triangle congruence relationship with equilateral triangles. Congruent Triangles This interactive applet demonstrates a surprising triangle congruence relationship with squares. Collection of Congruent Triangle Relationships This is a collection of 13 diagrams that demonstrate the relationship between and among various triangles. Collection of Similar Triangle Relationships This is a collection of several diagrams that demonstrate the relationship between and among similar triangles. All triangles are Isosceles! A fallacious proof that all triangles are Isosceles triangles. Geometric Mean Applet This is a demonstration with proof showing the relationships among the lengths of sides of a right triangle and its geometric means.
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