Which formula is used to find the side adjacent?

The formula used to find the side adjacent involves the relationship between the lengths of the sides of a right triangle. In trigonometry, the adjacent side is typically found using the cosine function, where the cosine of an angle is defined as the ratio of the length of the adjacent side to the length of the hypotenuse. The formula C = A/H properly reflects this relationship, where C represents the cosine of the angle, A is the length of the adjacent side, and H is the length of the hypotenuse.

By utilizing this formula, one can determine how the lengths of the triangle's sides relate to one another concerning a specific angle, making it a fundamental equation for solving problems related to right triangles in trigonometric contexts. This understanding of side relationships is crucial in many applications within geometry, physics, and engineering scenarios.