A right angle is a 90 degree angle This is the angle 2 things make when they meet 'square', like the floor with the wall, or a table leg with a floor The symbol for a right angle is a little square like this
An angle of 90 degrees (cf From Geometry to Probability Discussion, Rectangle Discussion)
angle equal to 90 degrees -- "A parallelogram with right angles is called a rectangle " (250)
If two things are at right angles, they are situated so that they form an angle of 90° where they touch each other. You can also say that one thing is at right angles to another. two lasers at right angles. n. An angle formed by the perpendicular intersection of two straight lines; an angle of 90°
An angle that is 90° It is the angle between two lines or planes that are perpendicular to each other The corner of a square, for example, is a right angle