Khan Academy
Khan Academy: Triangles: 45 45 90 Triangle Side Ratios
Showing the ratios of the sides of a 45-45-90 triangle in this short video.
Khan Academy
Khan Academy: Triangles: 30 60 90 Triangle Side Ratios Proof
This video explores proving the ratios between the sides of a 30-60-90 triangle.
Khan Academy
Khan Academy: Triangles: 45 45 90 Triangles
Students are provided an introduction to 45-45-90 triangles by watching a video tutorial.
Khan Academy
Khan Academy: Worked Examples: Geometry: Pythagorean Theorem, Area
Students watch a video tutorial to learn how to solve area problems of composite figures using the Pythagorean Theorem.
Khan Academy
Khan Academy: Trig to Solve the Sides and Angles of a Right Triangle
Worked example using trigonometry to solve for the lengths of the sides of a right triangle given one of the non-right angles.
Khan Academy
Khan Academy: Triangles: Another Pythagorean Theorem Proof
Students explore the Pythagorean Theorem by exploring a visual proof of the Theorem as they watch a video tutorial.
Sophia Learning
Sophia: Calculating the Area of a Triangle
This video lesson demonstrates how to calculate the area of a triangle. It includes detailed examples including ones that use the Pythagorean Theorem. Students can check their understanding with an assessment. [10:43]
Sophia Learning
Sophia: Identifying Trigonometric Ratios From a Right Triangle
Use a right triangle to identify the six trigonometric ratios such as cosine, sine, tangent, co-secant, secant, and cotangent. Assess learning with a quiz. [6:54]
Sophia Learning
Sophia: Inverse Cosine
Solve for an unknown angle of a right triangle using the inverse cosine. Assess learning with a quiz.
Sophia Learning
Sophia: Inverse Tangent
Solve for an unknown angle of a right triangle using the inverse tangent. Take a quiz to assess learning.
Sophia Learning
Sophia: Rectangle Practice Problems
This video lesson describes the characteristics of rectangles and provides examples of how to find area, perimeter, diagonals, and angle measurements. [7:00]
Sophia Learning
Sophia: Slant Height of a Cone
This video lesson demonstrates how to find the slant height of a right cone. Students can check their understanding with an assessment. [6:18]
Sophia Learning
Sophia: Slant Height of a Pyramid
This video lesson demonstrates how to use the Pythagorean Theorem to find the slant height of pyramid.
Sophia Learning
Sophia: The Hypotenuse
In this video tutorial, the instructor defines and explores the hypotenuse of a right triangle. Students can check their understanding with a quiz. [1:35]
Sophia Learning
Sophia: Area of a Rhombus
This video lesson demonstrates two ways for calculating the area of a rhombus. Students can check their understanding with an assessment. [4:55]
Sophia Learning
Sophia: Pythagorean Theorem Proof
Find the area of several figures to prove the Pythagorean theorem. Complete quiz to check understanding. [5:16]
Khan Academy
Khan Academy: Example: Unit Circle Definition to Calculate Sin and Cos
Explains how to use the unit circle definition to calculate sin and cos of multiple angles. [15:26]
Virtual Nerd
Virtual Nerd: How Do You Find a Missing Angle in a Right Triangle?
It's important to first identify what type of triangle you're working with before trying to solve for a missing interior angle measurement. Learn how by watching this tutorial. [3:34]
Virtual Nerd
Virtual Nerd: Determine if a Triangle Is a Right Triangle if You Know Its Sides
Take a look at this tutorial and learn how to use the Pythagorean theorem to see if a triangle is a right triangle. [2:49]
Imagine Learning Classroom
Learn Zillion: Lesson Video for 'Create a Right Triangle on a Coordinate Plane'
In this lesson, you will learn how to create a right triangle on a coordinate plane by using two points that form a diagonal line segment. [4:39]
Virtual Nerd
Virtual Nerd: How Do You Find a Missing Hypotenuse in a 45 45 90 Triangle?
In this tutorial, see how to solve for a missing side length by using your knowledge of 45-45-90 triangles to find a scale factor and set up an equation to solve. [4:51]
Math Antics
Math Antics: The Pythagorean Theorem
Gain a basic understanding of the Pythagorean Theorem by watching this easy to understand video tutorial. Additional resources are available as part of a paid subscription service. [12:55]
Khan Academy
Khan Academy: Triangles: Circumcenter of a Right Triangle
The video tutorial shows that the midpoint of the hypotenuse is the circumcenter.
Loyola University Chicago
Math Flix: Pythagorean Theorem Equation Practice
This QuickTime movie provides an excellent opportunity to apply the Pythagorean Theorem to several right triangles. As you watch and listen to the teacher and student interact it helps clarify the thinking behind applying this concept.