central angle

noun Geometry.
an angle formed at the center of a circle by two radii.

Origin:
1900–05

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
central angle
 
n
an angle whose vertex is at the centre of a circle

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Science Dictionary
central angle   (sěn'trəl)  Pronunciation Key 
An angle formed by two rays from the center of a circle, with the center forming the vertex.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The pie chart uses a common radius and varies the central angle according to
  the data.
All curved line segments of the plat shall be labeled with the central angle,
  arc length, and radius length.
The central angle in degrees of arc between the hypocenter and the station.
Now connect these to points to the center of the diameter line so that a
  central angle is formed.
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