Question

follow these steps to derive the law of cosines.

1. the relationship between the side lengths in $\triangle abd$ is

$c^{2}=x^{2}+h^{2}$ by the

Explanation:

Step1: Identify triangle type

$\triangle ABD$ is a right triangle (right angle at $D$), with hypotenuse $c$, legs $x$ and $h$.

Step2: Match to theorem

The formula $c^2 = x^2 + h^2$ is the definition of the theorem that relates the sides of a right triangle.

Answer:

Pythagorean Theorem