from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun An angle formed by the perpendicular intersection of two straight lines; an angle of 90°.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun geometry An
angleof 90 degrees; the bisectof the angle formed by a single straight line.
- noun mathematics An
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the 90 degree angle between two perpendicular lines
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