A right angle is an angle of ninety degrees. A square has four right angles.
2.
See at right angles
right angle in British English
noun
1.
the angle between two radii of a circle that cut off on the circumference an arc equal in length to one quarter of the circumference; an angle of 90° or π/2 radians
2. at right angles
▶ Related adjective: orthogonal
Derived forms
right-angled (ˈright-ˌangled)
adjective
right angle in American English
an angle of 90 degrees; angle made by the meeting of two straight lines perpendicular to each other
Examples of 'right angle' in a sentence
right angle
Slowly lower your body down until your arms form right angles.
The Sun (2013)
Bend your arms at right angles and pump them to help to get you up the stairs.
Times, Sunday Times (2008)
Bring legs up at right angle to floor.
The Sun (2008)
Holding on to the seat, lower your bottom until arms form a right angle.
The Sun (2006)
He was left hanging above the 8ft drop with his other leg at a right angle across the floor.
The Sun (2012)
Your knees should be in line with your pelvis, or slightly lower, and your lower legs at a right angle to your thighs.
Times, Sunday Times (2006)
Bend your arms at a right angle and pump them backwards and forwards, with all the movement coming from your shoulder, not your forearms or wrists.