The Unit Circle
As a battle-scarred veteran of Geometry, you already know a bit of trigonometry from working with triangles. Trigonometry, though, is more about angles than it is about the triangles themselves, so it is useful in many different settings in math. We're going to see that in this unit using the unit circle. We'll learn more about circles, more about trig, and maybe even more about ourselves. Get ready for a journey of self-discovery and adventure as we—pffffft, we couldn't finish that with a straight face. Yeah, this stuff won't change your life, but it will teach you something about solving trigonometric equations.