Virtual Nerd: How Do You Find a Missing Angle in a Triangle?

This tutorial demonstrates how to create an equation and solve it to find the missing measurements in a quadrilateral. [4:13]

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]

Oh no, there is a missing angle in a quadrilateral. Where did it go? It didn't go anywhere, it's just missing the value of the angle. So how do you find that missing value? Use a formula of course. Everything in algebra uses a formula....

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]

Are you working on finding the missing angles in triangles in your class? Consider this video. An instructor uses the triangle sum theorem to create an equation that helps her find the missing angles. She explains each step and writes...

The interior angles of any and ALL triangles adds up to 180 degrees. So if given two of the angle degrees, is it possible to find the value of the third angle? Yes! Use the triangle sum theorem to solve for the missing angle. Watch this...

Review for the SAT by reviewing how to figure out if the values in a replacement set are part of a solution set to an inequality. Watch this video for an example. [2:03]

Are you working on finding the missing angles of triangles in your class? Consider this video. An instructor uses the triangle sum theorem to create an equation that helps her find the missing angles. She explains each step and writes...

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]

This video tutorial takes you through the process of finding the common difference which you can then use to find the next terms in an arithmetic sequence. [2:04]