# Right angle facts for kids

A **right angle** is an angle with a measurement of 90 degrees. When two lines cross each other so that all the angles have the same size, the result is four right angles. The top of the letter T is at right angles to the vertical line. Walls of buildings are usually at right angles to the floor. Two things that are at right angles are called "**perpendicular**" or "orthogonal". This is expressed using the symbol (such as in ).

Planes (flat surfaces) can also meet at right angles. In a building, a wall and a floor are said to be perpendicular to each other, and they have a right angle. It also can be called a square angle.

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Right angle Facts for Kids. *Kiddle Encyclopedia.*