Acute and Obtuse Angles Primary Sources Reviewed by Teachers

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Ojk's Precalculus Study Page: The Law of Cosines

For Students 9th - 10th Standards

An introduction to solving acute and obtuse triangles by using the law of cosines, including a derivation of the formula. Includes several pistures and examples.

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Ojk's Precalculus Study Page: The Law of Cosines

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