# Talk:Concentric

WikiProject Mathematics (Rated Start-class, Mid-importance)
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Mathematics rating:
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Field: Geometry

## Belongs at Wiktionary?

This should become a disambig page, with dictionary stuff being sent to Wiktionary. Thoughts? --Dweller 14:32, 22 September 2006 (UTC)

## Measuring concentricity?

I came here to find out how concentricity is measured or expressed - what are the units of non-concentricity - percentage? (4crates 05:24, 27 February 2007 (UTC))

## Usage

Hi! I'm no expert on math and geometry, but (or so) I have a question about the sentence, "Circles, tubes, cylindrical shafts, disks, and spheres may be concentric." May a circle be concentric, or IS a circle concentric? Thanks!

Ulrik

Two given circles either are or are not concentric. A single circle being concentric or not makes no sense, because the meaning of concentricity is that two (or more) objects share a center. What the sentence tries to say is that objects that do not have a radial center (e.g. squares) are not called concentric, even if they would share the same centroid. -- Jao 10:43, 6 April 2007 (UTC)

this was realy helpful —Preceding unsigned comment added by 86.172.104.138 (talk) 12:30, 25 January 2009 (UTC)