Right Triangles Teacher Resources

[Free Registration/Login may be required to access all resource tools.] Find distances using angles expressed as bearings. Here you'll learn how to relate right triangle relationships to course bearings.

Solve word problems by modeling real-world (and not-so-real) situations as right triangles and using trigonometry.

Proof showing that a triangle inscribed in a circle having a diameter as one side is a right triangle.

The sine ratio is not only used to identify a ratio between two sides of a right triangle, but it can also be used to find a missing side length. This tutorial shows you how to use the sine ratio to find that missing measurement. [4:29]

In this tutorial, find out how to find the tangent of a particular angle in a right triangle. [3:13]

Use the Pythagorean Theorem to determine if the given side lengths could form a right triangle, i.e., which set forms a Pythagorean triple. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a...

Given two sides in a right triangle, find one of the acute angles using trigonometry.

Learn how to find the sine, cosine, and tangent of angles in right triangles.

Learn how to use trig functions to find an unknown side length in a right triangle.

Sal is given a right triangle with an acute angle of 65 degrees and a leg of 5 units, and he uses trigonometry to find the two missing sides.

Special right triangles are investigated in this video tutorial. The lesson provides background knowledge and two videos that show the relationships of the sides in special right triangles and practice problems to test students'...

Special right triangles are explored in this video tutorial. The lesson provides four videos that explain the side ratios for 45-45-90 and 30-60-90 triangles along with real-world examples involving each type of triangle.

Determine if the Pythagorean theorem can be used with triangles that are not right triangles. Assess learning with a quiz.

Take this ten question quiz on right triangles as a review for a quiz or test. After submitting your results, you will get step by step instructions for each problem.

Learn how to "solve" a right triangle and apply the concept to real world situations using angles of elevation and depression.

This site from MathWorld.com offers extensive information on right triangles. The site contains information on numerous characteristics of right triangles, including constructing similar inscribed triangles, altitudes, Pythagorean...

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...

This task provides a good opportunity to use isosceles triangles and their properties to show an interesting and important result about triangles inscribed in a circle with one side of the triangle a diameter. The fact that these...

Navigator Activity: This is a review of the right triangle in the coordinate plane. Given two lines (2 really nice ones) the students write the equation of the 3rd line to create a right triangle. They find the vertices of the 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.

WebMath offers a java applet that allows you to input information about a right triangle, and then solves the triangle for any of the missing pieces of information. It also gives a detailed solution using the information that you provided.

This QuickTime movie provides an opportunity to learn about the characteristics of the isosceles right triangles. As you watch and listen to the teacher and student interact it helps clarify the thinking behind applying this concept.

This video demonstrates how to find various measures of triangles formed by the medians of a right triangle.

Given one side length and an acute angle in a right triangle, find another side using trigonometry. Students receive immediate feedback and have the opportunity to try questions repeatedly, watch a video or receive hints.