Curated OER
How to Make an Origami Paper Hat
This video shows you and your class how to make an origami hat. Why would you do such a thing? If you think about it origami builds eye hand coordination, is fun, is culturally significant, and this hat, is full of measurable angles....
Curated OER
Tangents and Circles - Geometry Help
Does watching a person do a math problem help you understand a mathematical concept? If it does then this clip will be a great help. The tutor in this clip completes a geometry problem involving tangents, circles, and the Pythagorean...
Curated OER
What is a 30¡-60¡-90¡ Triangle?
Is it possible to take an equilateral triangle and cut it in half to make a 30-60-90 special triangle to make it easier to solve a problem? Why yes, of course! It's even possible to find the missing length without using the Pythagorean...
Curated OER
How Do You Solve a Problem Using an Angle of Elevation?
One given angle and one given length equals an unknown height. What? Here's a word problem that can be solved given two pieces of information by using the correct formula. Watch the instructor explain how to use the tangent ratio formula...
Massachusetts Institute of Technology
Mit: Blossoms: The Pythagorean Theorem: Geometry's Most Elegant Theorem
Use this video to help teach the Pythagorean Theorem. The video can be downloaded, there is a transcript of the video, and a teacher's guide to aid in using the video. [21:38]
Massachusetts Institute of Technology
Mit: Blossoms: The Broken Stick Experiment
An MIT engineering professor leads teachers and students through an activity in triangle formation and probability that requires a meter stick and other basic classroom materials. This video [33:08] is accompanied by a teacher's guide,...
Massachusetts Institute of Technology
Mit: Blossoms: Broken Stick Experiment: Triangles/random Numbers/probability
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]
PBS
Pbs Learning Media: Triangles: Testing the Strength of a Gumdrop Dome
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]
Virtual Nerd
Virtual Nerd: How Do You Determine if a Triangle Is a Right Triangle
In this video lesson a students learns how to determine if a triangle is a right triangle by using the Pythagorean Theorem.
Sophia Learning
Sophia: Scalene Triangles: Lesson 4
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."
PBS
Pbs Learning Media: Designing the Citigroup Skyscraper
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...
Math TV
Math tv.com: Trigonometric Functions: Angles, Degress, and Special Triangles
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...
Math Planet
Math Planet: Geometry: Triangles
Discussion of triangles through the use of examples and a video lesson. [1:08]
Sophia Learning
Sophia: Cpctc: Lesson 4
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."
Sophia Learning
Sophia: Finding the Missing Side of a 45 45 90 Triangle: Lesson 1
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."
Sophia Learning
Sophia: Sides of a Triangle: Lesson 6
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."
Sophia Learning
Sophia: Triangle Exterior Angles Practice: Lesson 6
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."
Sophia Learning
Sophia: Finding the Missing Side of a 45 45 90 Triangle: Lesson 8
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."
Khan Academy
Khan Academy: Triangles: Right Triangles Inscribed in Circles (Proof)
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.
Khan Academy
Khan Academy: Triangles: Fill in the Blank Triangle Proofs Example 2
This video will fill in the blanks in a proof showing that the triangles are congruent.
Virtual Nerd
Virtual Nerd: What Is the Pythagorean Theorem?
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]
Virtual Nerd
Virtual Nerd: What Is a Triangle?
This tutorial explains triangles and their different types. [5:58]
CK-12 Foundation
Ck 12: Elem Math: Overview Sum of the Angles of a Triangle
[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.
CK-12 Foundation
Ck 12: Elem Math: Overview of Rectangles Squares Circles and Triangles
[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.