An angle formed by the perpendicular intersection of two straight lines; an angle of 90°.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "right angle" in a sentence
"A large, tree-trunk-like projection emerged from the object, made a right angle turn, and met up with the floor."
"He played the light up the wall to the fifty-foot-high ceiling and then followed the wall away from him until the surface ended at a right angle to another wall."
"The gnomon is a right angle triangle in which the southern angle equals your hometown latitude."