Question

deriving the law of cosines
follow these steps to derive the law of cosines.

1. the relationship between the side lengths in △abd is (c^{2}=x^{2}+h^{2}) by the

check

Explanation:

Step1: Identify triangle type

$\triangle ABD$ is a right - triangle.

Step2: Recall relevant theorem

In a right - triangle, the Pythagorean theorem states that for a right - triangle with legs of lengths $x$ and $h$ and hypotenuse of length $c$, $c^{2}=x^{2}+h^{2}$.

Answer:

Pythagorean theorem