What Is the Formula for the Law of Cosines?

What Is the Formula for the Law of Cosines?

What Is the Formula for the Law of Cosines?

The formula for the law of cosines is c^2 = a^2 + b^2 - 2ab x cos(C), where a, b and c are the sides of a triangle, and C is the angle opposite side c. The law of cosines is derived from the Pythagorean theorem.

The law of cosines can be used to find the angles of a triangle when only given the lengths of each side. It can also be used to the find the length of a side when given the lengths of two sides and the size of the angle opposite the unknown side. For example, for the triangle where a = 9, b = 5 and c = 8, the value of c is calculated as 62.2 degrees.