Try this triangle pop-up greeting card! Amaze your friends with your talent and creativity!

Use a "linkage strip" to build triangles with different side lengths. When you build a triangle, see if you can deform it into a different triangle while keeping the side lengths the same.

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

In this lesson, students explore properties of triangles. They fold paper to make a triangle and measure its angles. Students also draw triangles with given conditions. Included are examples, discussion questions, and closing activities.

Given one side length and an acute angle in a right triangle, find another side using trigonometry.

This site gives the definition of acute triangles.

This site provides the definition of Scalene triangles.

This site gives the definition of obtuse triangles.

This site gives the definition of isosceles triangles.

Exercises explain how to construct an altitude to a triangle.

Bermuda is a mysterious place. Meet Scotty and his family and join them on their holiday to learn about energy transfer in ecosystems.

[Free Registration/Login Required] This is a collection of design and shape templates from the Maths and Islamic Art & Design sections of the Victoria and Albert Museum. It provides the following templates: Islamic circular grid,...

Four basic geometric shapes - the triangle, parallelogram, trapezoid, and hexagon - are examined to determine how many of one shape fits "inside" another. For instance, how many triangles are "in" a hexagon. Ten questions with solutions...

Introduces the concept of regular polygons along with regular polygon examples, not regular polygons, irregular polygons, and area of a regular polygon. Check-out the solved examples for better understanding and try your hand at solving...

This tutorial contains detailed information about the Binomial Theorem. Includes practice exercises and interactives.

Practice using your graphing calculator for measuring and constructing polygons and other plane figures. If you get stumped or if you would like to check your work, then select the View Solution button, which is located directly under...

Based on building a hexagon, this activity from the Math Forum collection focuses on using different combinations of pattern blocks to create a hexagon. An online activity, pencil and paper method, literature connections, and a...

Practice using your graphing calculator for similarity and proportion problems. If you get stumped or if you would like to check your work, then select the View Solution button, which is located directly under each problem.

Explore different ways of proving some theorems about lines and angles. Some transformations are used.

This website has basic definitions for most polygons, regular and irregular.