Law of cosines

Trigonometry

The law of cosines is used to find a triangle’s unknown sides or angles. It relates the side lengths of a triangle to the cosine of one of its angles with the following equations:

law_of_cosines

The law of cosines can only be used when:

- Two side lengths and the angle between them (the included angle) are known

or,

- All three side lengths are known.

School hallway

Learn what it means to bring Yup to your school or district