An angle that measures exactly 90 degrees is known as what?

An angle that measures exactly 90 degrees is termed as a right angle. This is a fundamental concept in geometry, as right angles play a crucial role in identifying perpendicular lines and establishing the basic right triangle relationships.

In many geometric contexts, one can visually identify a right angle because it often forms a square corner. The significance of identifying right angles is key to various applications, including constructing geometric figures, understanding properties of shapes, and solving problems involving those shapes.

On the other hand, acute angles measure less than 90 degrees, obtuse angles measure more than 90 degrees but less than 180 degrees, and straight angles measure exactly 180 degrees. Each type of angle has its specific characteristics and applications within geometry, making the classification of right angles essential for further studies in the subject.