What is the mathematical name for a 'circle sector' applied to a 'ring'?

[741]

I'm drawing a graphic which is like a doughnut chart. If we call the shape between 2 concentric circles a 'ring', what is the correct term for a 'partial ring'?

(I'd like to give the relevant variables meaningful names, preferably based around mathematically correct terms)

[Mechatrommer]

just google "partial donut shape mathematics"
Annulus Sector
Annulus (Mathematics)

[741]

OK Thanks, it seems the term is going to be "Annular Sector".

[SiliconWizard]

The "correct" math term would be annulus sector, but I admit this doesn't sound very appealing for some reason, so I'll concede the annular sector.

[741]

That was my intuitive feeling, but I must (now) admit "annular sector", whilst sounding nicer, is a contradiction: Like saying "circular sector". A sector cannot be itself circular or annular I suppose.

[Nominal Animal]

I admit, the first thing that came to my mind was "sphincter".  But yeah, annulus it is.

[SiliconWizard]

That was my intuitive feeling, but I must (now) admit "annular sector", whilst sounding nicer, is a contradiction: Like saying "circular sector". A sector cannot be itself circular or annular I suppose.

Yeah, it didn't sound this weird to me at first (due to this not being my native language), but it is. It's not exactly a contradiction I'd say, more like a definition turned upside down.
But yeah, "annulus" frankly sounds horrible.

Even if it's probably less correct, and more informal, wouldn't "ring sector" be appropriate, and sound better?

[SL4P]

I’ll throw ‘arc’ into the discussion!

[Mechatrommer]

really, whats wrong with Annulus? its not like Annalus and Annalar wont solve anything... there will be always something to talk, move on!...

I’ll throw ‘arc’ into the discussion!

arc is a "curvular" line of zero area. https://en.wikipedia.org/wiki/Arc_(geometry) whatever