eBook
CK-12 Foundation

Ck 12: Interactive Geometry: 17.4 Inverse Trigonometric Ratios

For Students 9th - 10th Standards
Define the trigonometric ratios in terms of ratios of the sides of a right triangle.
Activity
Analyze Math

Analyze Math: Inverse Trigonometric Functions

For Students 9th - 10th Standards
The mathematics tutorial examines inverse trigonometric functions. The tutorial consists of explorations and examples. The interactive applet allows students to investigate domain, range, and graphs of inverse trigonometric functions.
Unit Plan
Khan Academy

Khan Academy: Trigonometric Ratios in Right Triangles

For Students 9th - 10th Standards
Learn how to find the sine, cosine, and tangent of angles in right triangles.
Activity
Windstream

Ojk's Precalculus Study Page: Evaluating and Graphing Sine and Cosine

For Students 9th - 10th Standards
An introduction to graphing the sine and cosine functions by using the 30-60-90 and 45-45-90 right triangle values of the two functions as guides.