Right angle facts for kids

The little square indicates that this is a right angle

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.

Related pages

• Acute angle
• Obtuse angle
• Parallel (geometry)

Images for kids

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  Another option of diagrammatically indicating a right angle, using an angle curve and a small dot.

See also

In Spanish: Ángulo recto para niños