Basic Trigonometry: Math Videos

This series introduces trigonometry, the math of triangles, angles, and circles. You will learn about the unit circle, radians and degrees, and how to use sine, cosine, and tangent to solve for missing sides and angles. You will also learn inverse trig functions and how to change the shape of a trig graph. Two fun videos debate whether pi or a number called tau is the better circle constant. You should be comfortable with basic geometry and algebra first.

Note: All Khan Academy content is available for free at www.khanacademy.org