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.

In this mini-lesson, learn about obtuse triangles including the obtuse triangle definition, sides, properties, examples, and other fun facts related to it.

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.] Prove two triangles are congruent with the Side-Side-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]

What better way to get to know your students than with a 1:1 interview. Today you will interview each student on their knowledge of triangles and their ability to separate them from other shapes.

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...

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

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.

Learn about similar triangles with this helpful reference tool. Provides a detailed definition, examples, and an interactive activity that enhances further explanation. Includes links to related topics.

Given two similar triangles and some of their side lengths, find a missing side length.

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.

A instructional activity that explores the Triangle Shirtwaist Factory fire that occurred on March 25, 1911 in New York City.

Here is a site that clearly and thoroughly explains the trigonometry of the 30-60-90 right triangle. There are example problems solved, problems for the student to attempt, and answers to the student problems. Point this site out to...

Looks at the garment factory industry in the 1800s and the early part of the 20th century, where workers toiled in sweatshop conditions. After a terrible fire at the Triangle Shirtwaist Company in 1911, labor unions gained support in...

To find the area of a triangle, try to make a parallelogram using a copy of the triangle.

The density triangle is a memory tool to help students remember the formula for density, D = M / V, and its variations.

Let's talk about shapes baby. Let's talk about vertices. Leeettsss talk about all the things that triangles need to be, Oh let's talk abbbooouuut shapes! It's not Salt N Peppa but you can get your groove on with today's triangle talk.