Examples and derivations from the wonderful world of trigonometry

You should know how to label the most-frequently-used angles around the **unit circle** (circle of radius r = 1), both in degrees and radians. It's not that difficult if you just think of it as counting around the circle in different increments.

Minutes of your life: 3:25

You'll make your journey through trigonometry much easier if you memorize everything needed to derive the trig functions of 30˚, 45˚ and 60˚ angles. Here's how to do it.

Minutes of your life: 3:42

Here are two examples of how we use SOH-CAH-TOA trig. to solve for the missing sides of a right triangle. This is a basic skill in trigonometry that you should master.

Minutes of your life: 4:48 (two examples)

The **law of sines** is an important relationship between the angle measures and side lengths of non-right triangles. In this video you'll see where it comes from.

Minutes of your life: 2:04

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