When a straight line standing on a straight line makes the adjacent angles equal to one another.

an angle of 90'; an angle made by the meeting of two straight lines perpendicular to each other

An angle measuring 90 degrees. Two line segments that meet at right angles are said to be perpendicular.

A right angle between two lines measures ninety degrees and is graphically represented by a small square at the vertex.

the 90 degree angle between two perpendicular lines

an angle equal to half the angle from one end of a line segment to the other

an angle that measures 90 degrees

an angle measuring exactly 90

an angle whose measure is exactly 9 Rotation a transformation of a figure by turning it about a center point or axis. The amount of rotation is usually expressed in the number of degrees (e.g., a 9 rotation). Also called a Tur

An angle that measures exactly 90º.

A right angle looks like the corner of a square; it extends ninety degrees. Each of the interior angles of a square is a right angle.

An angle whose measure is 90°.

An angle formed by two perpendicular lines, the measure of which is 90º.

An angle with a measure of 90.