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Cosine as the Ratio of Two Sides of a Triangle

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<iframe src="https://dmccreary.github.io/geometry-course/sims/cosine/cosine.html" width="100%" height="450px" scrolling="no"></iframe>

Description

This MicroSim demonstrates how the cosine can be visualized as the ratio of the adjacent side to the hypotenuse in a right triangle. Students can adjust the angle and observe how the cosine value changes.

Cosine With Plot

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