This learning video is designed to develop critical thinking in students by encouraging them to work from basic principals to solve a puzzling mathematics problem that contains uncertainty. [33:08]

Can a dome made of gumdrops and toothpicks support the weight of a stack of books? To find out, watch this video segment adapted from ZOOM. [2:31]

In this video lesson a students learns how to determine if a triangle is a right triangle by using the Pythagorean Theorem.

After this lesson, you'll be able to pinpoint a scalene triangle based on the fact that no sides or angles in a scalene triangle are congruent. It is 4 of 6 in the series titled "Scalene Triangles."

This video segment adapted from the PBS series "Building Big" shows how a structural engineer overcame the challenges of building New York's Citigroup skyscraper over a church by using triangles to add muscle and stability to the...

Students learn about the notation and vocabulary associated with angles and triangles. The learning resource consists of a video tutorial and a worksheet with practice problems. In the left hand menu, click Trigonometry, Trigonometric...

Discussion of triangles through the use of examples and a video lesson. [1:08]

This video lesson [6:45] will demonstrate the use of CPCTC in triangle congruencey proofs. It is 4 of 4 in the series titled "CPCTC."

In this lesson, you'll learn how to use the lengths of two sides of a triangle and the ratio of the side lengths to find the length of the missing side. It is 1 of 9 in the series titled "Finding the Missing Side of a 45-45-90 Triangle."

This lesson explains the rules for side lengths involved in creating a triangle. It is 6 of 7 in the series titled "Sides of a Triangle."

This lesson provides practice problems that apply the triangle exterior angles theorem. It is 6 of 6 in the series titled "Triangle Exterior Angles Practice."

In this lesson, you'll learn how to use the lengths of two sides of a triangle and the ratio of the side lengths to find the length of the missing side. It is 8 of 9 in the series titled "Finding the Missing Side of a 45-45-90 Triangle."

This video tutorial explains that if the diameter of a circle is one of the sides of a triangle inscribed in the circle then the triangle is a right triangle.

This video will fill in the blanks in a proof showing that the triangles are congruent.

Video provides an introduction to the Pythagorean theorem and shows how it is used to solve for a missing length on a right triangle. [3:54]

This tutorial explains triangles and their different types. [5:58]

[Free Registration/Login may be required to access all resource tools.] Students watch a video overview on funding the sum of angles in a triangle.

[Free Registration/Login may be required to access all resource tools.] Students watch a video overview on various two dimensional shapes including rectangles, squares, circles and triangles.

[Free Registration/Login may be required to access all resource tools.] Students watch a video overview on how to classify triangles based on side length.

[Free Registration/Login may be required to access all resource tools.] Students watch a video overview on the properties of rectangles, squares, circles and triangles.

[Free Registration/Login may be required to access all resource tools.] Students watch a video overview on how to find missing angles in triangles.

[Free Registration/Login may be required to access all resource tools.] Students watch a video overview on how to classify triangles.

The Law of Sines helps with finding a missing side or angle measurement of a triangle. Watch this tutorial to learn about this proportion. [5:57]

Explanation of the Koch Snowflake and why it has an infinite perimeter but a finite area.