Excellent review site on similar triangles. Includes diagrams and explanation of application.

Explore and learn about the features and properties of a right triangle in this lesson. Includes examples and practice questions.

This mini-lesson explores the world of the midsegment of a triangle by finding the answers to questions like what is midsegment of a triangle, triangle midsegment theorem, and proof with the help of interactive questions.

Students will learn how to apply the properties and characteristics of all triangles to solve real-world problems and identify and use the unique characteristics of right, isosceles, equilateral, acute, obtuse, and scalene triangles.

This lesson focuses on triangle congruence; it shows the ways to prove that triangles are congruent.

[Free Registration/Login may be required to access all resource tools.] This concept introduces students to the SAS Triangle Postulate and how to prove that two triangles are congruent given only information about two pairs of sides and...

[Free Registration/Login may be required to access all resource tools.] Prove two triangles are congruent with the Side-Side-Side shortcut.

[Free Registration/Login may be required to access all resource tools.] Prove two triangles are congruent with the Side-Angle-Side shortcut.

[Free Registration/Login may be required to access all resource tools.] This concept introduces students to the ASA and AAS Triangle Congruence shortcuts. Students examine guided notes, review guided practice, watch instructional videos...

Explore and measure a variety of triangles.

Review the triangle similarity criteria and use them to determine similar triangles.

This interactive exercise focuses on the appearance and manipulation of triangles.

Wajdi Mohamed Ratemi shows how Pascal's triangle is full of patterns and secrets. [4:50]

Apply the property that the longest side of a triangle is opposite the largest angle to solve a few problems.

See how triangles are congruent where all corresponding angle pairs and sides are the same.

Learn how two triangles are congruent if and only if their corresponding sides and corresponding angles are congruent.

Discover if two triangles are congruent it means that all corresponding angle pairs and all corresponding sides are congruent.

This lesson will introduce students to different types of triangles by using a clip from the movie A Walk to Remember. They will take part in interactive tutorials to strengthen the concepts of classifying triangles. The students will...

In this task, we are told that two triangles share two sets of congruent sides and one pair of congruent angles and that these two triangles must be congruent based on the reasoning given. Students are asked to analyze this reasoning to...

Given two triangles with some of their side measures, determine whether the triangles are similar or not.

Given two triangles with some of their angle measures, determine whether the triangles are similar or not.

A complete reference guide to congruent triangles. It provides definitions, examples, and an interactive activity that enhances further explanation. Includes links to related topics.

Contains a brief outline on Patterns In the Pascal's Triangle.

As a resource for teachers, an activity of how to connect Venn Diagrams with the five methods of proving triangles congruent - SSS, SAS, ASA, AAS, HL - is explained.