Sagitta, Apothem, and Chord

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If a 55-gallon barrel lying on its side has 8 inches of grain at its deepest point, how much grain does it hold? For this and similar problems, the important keywords have non-intuitive names: sagitta, apothem, circular segment, and chord. This Demonstration illustrates each of these circle-related terms.

Contributed by: Ed Pegg Jr (March 2011)
Open content licensed under CC BY-NC-SA


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