A right angle is an angle that measures exactly 90 degrees. It is one of the most fundamental concepts in geometry and is often represented by a small square in the corner of the angle. Right angles are commonly found in everyday objects, such as the corners of a square or rectangle. In addition to its geometric significance, the right angle is essential in various fields, including architecture and engineering. It helps ensure structures are stable and balanced. The concept of right angles is also crucial in the Pythagorean theorem, which relates the sides of a right triangle.