Central Angle


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central angle

[′sen·trəl ′aŋ·gəl]
(mathematics)
In a circle, an angle whose sides are radii of the circle.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Central Angle

 

an angle formed by two radii of a circle. In Figure 1 angle AOB is a central angle. The number of degrees in

Figure 1

a central angle is equal to the number of degrees in the intercepted arc.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
When the sum of a folding angle and corresponding central angle of an element is 180[degrees], the scissor elements with the folding angle can be arranged around the ring.
Figure 5 gives the results extracted from the ALOS PALSAR data on 21 June 2007, where we show sectors with a radius of 4500 m, opening angles of 30[degrees], 45[degrees], and 60[degrees], respectively, and the orientation interval of the central angle of the upwind sector is 5[degrees].
In order to ensure that the central angle of the FSR region bearing stress always keeps 90[degrees] under the action of external force in any direction, the relationship between the inside radius (r) of the circuit board and the outside radius (R) of the fix ring should meet (3), as shown in Figure 5(a).
Based on the above simulation analysis, it can be drawn that the optimal curvature changes from 4r to 6r when the central angle of concave structure changes from 90[degrees] to 120[degrees].
For instance, the installation angle and the central angle of small arc construct the overlap area together; when a parameter value is changed, another parameter is inevitably under the influence.
In order to analyze the affection of the central angle on the antenna's return loss, Figures 6(a) and 6(b) show how the return loss of the presented antenna changes with the central angle parameters of the two Y-shaped strips.
(4) and (5) and the equation [n.sub.eff] = n(r), the central angle [zeta] can be derived as
where [[theta].sub.i] is the flapping angle of the ith hydrofoil, [A.sub.i] is the crest value of [[theta].sub.i], [[phi].sub.i] is the original phase angle, and [[theta].sup.0.sub.i] is the central angle of the flapping hydrofoil.
whose central angle has the same measure as its included arc,

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