Definition of "right angle" []

• 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.

• "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."