- 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
- at right angles ⇒ perpendicular or perpendicularly
WordReference Random House Learner's Dictionary of American English © 2026
ˈright ˈan•gle, n. [countable]
WordReference Random House Unabridged Dictionary of American English © 2026- Mathematicsthe angle formed by two perpendicular lines;
an angle of 90°.
right′ an′gle,
right′-an′gled, adj.
- Mathematicsthe angle formed by two radii of a circle that are drawn to the extremities of an arc equal to one quarter of the circle;
the angle formed by two perpendicular lines that intersect;
an angle of 90°. See diag. under angle 1.
- Middle English 1350–1400
Collins Concise English Dictionary © HarperCollins Publishers::
right angle n
'right angle' also found in these entries (note: many are not synonyms or translations):
bevel
- complement
- cube
- hypotenuse
- inclined plane
- oblique
- oblique angle
- radian
- right-angled triangle
- square
- adz
- Allen wrench
- bell crank
- bevel joint
- diageotropic
- fillet weld
- grad
- hypoid gear
- oblique triangle
- rectangle
- rectangular
- return
- right
- right triangle
- toggle joint
- ulu
- skew
- sprung molding