noun Date: 15th century the angle bounded by two lines perpendicular to each other ; an angle of 90° or 1/2 π radians, right-angled or right-angle adjective
RIGHT ANGLE
Meaning of RIGHT ANGLE in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012