Lesson: The Cosine Rule Physics • 9th Grade

In this lesson, we will learn how to use the cosine rule to find missing sides and angles in different triangles.

Lesson Video

Q1:

Find the perimeter of the parallelogram shown in the diagram.

Q2:

Find the perimeter of the triangle shown in the diagram.

Q3:

Find the size of angle , in degrees, of the triangle shown.

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