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straight angle

noun
1.
the angle formed by two radii of a circle that are drawn to the extremities of an arc equal to one half of the circle; an angle of 180°.
Origin of straight angle
1595-1605
First recorded in 1595-1605
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for straight angle
Historical Examples
  • This was excluded by the Greeks because their idea of angle required it to be less than a straight angle.

    The Teaching of Geometry David Eugene Smith
  • That there exists a triangle, the sum of whose angles is congruent to a straight angle, the Euclidean; II.

    The Mystery of Space Robert T. Browne
  • That there exists a triangle the sum of whose angles is greater than a straight angle, the Cayley-Klein.

    The Mystery of Space Robert T. Browne
  • The elliptic or Cayley-Klein hypothesis assumes that the angular sum is greater than a straight angle.

    The Mystery of Space Robert T. Browne
British Dictionary definitions for straight angle

straight angle

noun
1.
an angle of 180°
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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straight angle in Science
straight angle
  (strāt)   
An angle having a measure of 180°.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Word Value for straight

12
12
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