right angle
Concise Oxford English Dictionary © 2008 Oxford University Press:
right angle
▶noun an angle of 90°, as in a corner of a square.
– phrases
at right angles to forming an angle of 90° with.
at right angles to forming an angle of 90° with.
– derivatives
right-angled adjective.
right-angled adjective.
'right angle' also found in these Oxford entries:

