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Learn how to use the cosine rule to find the third side or the angles of a triangle when you know two sides and the angle between them. See examples, formulas, and tips to remember the law of cosines.
- The Law of Sines
The Law of Sines (or Sine Rule) is very useful for solving...
- The Law of Sines
Learn how to use the cosine rule to find the lengths of the sides of a triangle or the angles between them. The cosine rule is also called the law of cosines or the cosine formula. See the proof, the formula and solved examples.
In trigonometry, the law of cosines (also known as the cosine formula or cosine rule) relates the lengths of the sides of a triangle to the cosine of one of its angles.
Learn how to use the law of cosines to find the missing side or angle of a triangle given the known elements. The law of cosines relates the lengths of the sides of a triangle to the cosine of one of its angles and generalizes the Pythagoras theorem.
Learn how to use the law of cosines to find an unknown angle in a triangle given the lengths of the sides. Watch a video example and see comments and questions from other learners.
The law of cosines is a formula that relates the three sides of a triangle to the cosine of a given angle. When to use law of cosines? There are 2 cases for using the law of cosines. Why only the 'included' angle? As you can see in the prior picture, Case I states that we must know the included angle .
Learn the cosine rule, a formula that relates all three sides of a triangle with an angle. See the statement, proof, applications, and problem solving examples of the cosine rule.
