Question

The square of any side of a triangle is equal to the sum of the squares of the other two sides minus the product of these sides and the cosine of their included angle.a. Law of Cosines c. Law of Sinesb. Law of Cotangents d. Law of Tangents

Answer 1

Given,

The statement is

"The square of any side of a triangle is equal to the sum of the squares of the other two sides minus the product of these sides and the cosine of their included angle."

Required

The law which define the above statement.

The law of cosine states that the square of any side of a triangle is equal to the sum of the squares of the other two sides minus the product of these sides and the cosine of their included angle.

`c^2=a^2+b^2-absinC`

Hence, option A is correct.