In a right triangle, which side is opposite the right angle?

In a right triangle, the side opposite the right angle is known as the hypotenuse. The hypotenuse is the longest side of the triangle and is always located directly across from the right angle. This relationship is fundamental in right triangles, where the two other sides are referred to as the "adjacent" and "opposite" sides relative to the angles other than the right angle. The properties of triangles, including the Pythagorean theorem, revolve around the hypotenuse, confirming its significance in both geometry and trigonometry. Understanding that the hypotenuse is uniquely defined as the side across from the right angle is essential for solving problems involving right triangles.