right angle definition
Full Definition of RIGHT ANGLE. : the angle bounded by two lines perpendicular to each other: an angle of 90Â° or 1â2 Ï radians. â rightâanÂ·gled \ËrÄ«t-ËaÅ-gÉld\ or rightâanÂ·gle \-gÉl\ adjective.See right angle defined for English-language learners.xamples of RIGHT ANGLE. 1  A square has four right angles. 2  Hold the nail at a right angle to the board. 3  The two boards are joined at right angles to each other.