To construct the name of a regular polygon with anything between 20 and 100 sides, a prefix is added to indicate the number of tens, the fragment -kai- to indicate continuation of the name, and a second part of the shape name to indicate the number of units in the shape, before the word -gon, deriving from the Greek word for "angle"
In this case, tetraconta- is the prefix used for the number 40, and di is the fragment concerning the number 2. Therefore, a tetracontakaidigon is a shape with 42 sides.
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