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Sum and Difference Formulas for Cosine and Sine

By YourMathGal

This video explains the sum and difference formulas and how to derive and apply them.

Parallel Line Equation

By Khan Academy

Parallel Line Equation. All Khan Academy content is available for free at www.khanacademy.org

How to Solve Similar Triangles Applications: Flagpole Problem

By Math Class with Terry V

YouTube presents How to Solve Similar Triangles Applications: Flagpole Problem, an educational video resource on math.

Trigonometric Functions To Find Unknown Sides of Right Triangles, Ex 2

Trigonometric Functions To Find Unknown Sides of Right Triangles, Ex 2. In this video, I use information about the length of the hypotenuse of a right triangle as well as a trig function to find the length of a missing side.

Volume of a Prism - YourTeacher.com - Math Help

By yourteachermathhelp

Instructor uses a white board to demonstrate how to find the volume of a rectangular prism. One example is modeled using the formula for volume and plugging in values.

Finding the Height of an Object Using Trigonometry, Example 1

By PatrickJMT

Finding the Height of an Object Using Trigonometry, Example 1. In this video, I find the height of a balloon by knowing a horizontal distance and an angle.