An annulus. Area = pi (R2 - r2) when R is radius of larger circle and r is radius of smaller circle.
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a circle that has been flattened a little is an
a hemisphere
semicircleA half circle is called a semicircle.Half a circle is a semi-circle
Well it could be called many things The Host - or - The Bread - or - a wafer are a few.
A part of a circle between two points on a circle is called is called an arc.