CK-12 Trigonometry

CK-12's Trigonometry-Second Edition is an introduction to trigonometry for the high school student. Topics include: Trigonometric Identities and Equations, Circular Functions, Polar Equations and Complex Numbers. Right triangles play an integral part in the study of trigonometry. It is from right triangles that the basic definitions of the trigonometric functions are formed. In this chapter we will explore right triangles and their properties. Through this, we will introduce the six basic trig functions and the unit circle.