## With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

No credit card required

### Conclusion

This chapter brings to an end your exploration of pre-calculus as presented in this book. Accordingly, you first reviewed the Pythagorean theorem and examined the standard right triangle. When you examined this triangle, you took a close look at the ratio between the lengths of the sides of the triangle and how they allow you to see how one of the most fundamental of the trigonometric ratios, the sine, comes to life.

Having explored these beginnings, you then examined ways to measure angles. While degrees provide a reliable approach to such measurements, radians often prove easier to work with. A radian is the arc of a circle equal in length to the radius of the circle. Using radian measures, you are able to express angles of a circle ...

## With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

No credit card required