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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.

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