Virtual Nerd: How Do You Find the Cosine of an Angle in a Right Triangle?

A trigonometric ratio is a ratio between two sides of a right triangle and includes the sine ratio. Discover how to find the sine of a particular angle in a right triangle by watching this video. [2:48]

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

A trigonometric ratio is a ratio between two sides of a right triangle. In this problem, find sin(A) in the given right triangle. Use the ratio of the opposite side over the hypotenuse.

What's a trigonometric ratio? It is a ratio between two sides of a right triangle. In this problem, find cosine(A) in the given right triangle. Use the ratio of the adjacent side divided by the hypotenuse to find cos(A). The instructor...

What's a trigonometric ratio? It is a ratio between two sides of a right triangle. In this problem, find tangent(A) in the given right triangle. Use the ratio of the opposite side divided by the adjacent side to find tan(A). The...

The Pythagorean theorem is useful in solving how to find the missing length of a side of a right triangle. Check out this tutorial to see how it's done. [4:09]

A right triangle. Two given measurements for two side lengths and one unknown length. Use the Pythagorean theorem to solve this problem and find the missing value. Squares and square roots are used in this problem and don't worry when...

The sum of the exterior angles of a polygon is always 360 degrees. Explore this tutorial and see how to use this knowledge to find missing measurements. [3:21]

Review for your SAT by brushing up on Venn diagrams. Watch this video on how to find the union and intersection of sets. [1:58]

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]