The Cosine Function and Right Triangles
An interactive GeoGebra applet that illustrates cosine as a ratio of sides of right triangles. User can manipulate one angle and vertex of two similar triangles to observe how the ratio of the adjacent side and hypotenuse changes.
Allows the student to visualize the definition of cosine as a ratio of sides of a right triangle.
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eduToolbox® is a resource-sharing portal developed by the Ayers Institute for Learning & Innovation with collaborative support and funding from the Tennessee Department of Education and the U.S. Department of Education's Math & Science Partnership program.
