Lesson: Law of Cosines Mathematics • Second Year of Secondary School

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In this lesson, we will learn how to find the sides and angles in non-right triangles using the law of cosines.

Students will be able to

recall the law of cosines, ,
recognize how the law of cosines can be applied to a triangle to determine an unknown side length (given a diagram or otherwise),
recognize how the law of cosines can be applied to a triangle to determine an unknown angle measure (given a diagram or otherwise).