Law of Cosines Worksheets
What is the Law of Cosines?
One of the branches of mathematics, which helps in describing the nature of the geometric figure, the triangle is known as trigonometry. There are various laws that help in solving the parts of the triangle which are not known. One of those laws is the law of cosine. The law of cosine is derived from the Pythagoras theorem, with the prospect that it works for all the triangles.
The law of cosine is: c2 = a2 + b2 - 2ab cosC
The two other versions of the law of cosines are: a2= c2 + b2 - 2bc cosA
And b2 = a2 + c2 - 2ac cosB.
Since all three versions differ in terms of labeling of the triangle, you can just verify one of them, and you're good to go.
Good Thing He Didn't Listen...
For God's sake, please give it up. Fear it no less than
the sensual passion, because it, too, may take up all your time and deprive
you of your health, peace of mind and happiness in life.
[A letter to his son Janos urging him to give up work on non-Euclidean geometry.]