In geometry, the "'decagrammic prism "'is one of an infinite set of nonconvex decagrams.
3.
Deeper truncations of the regular decagon and decagram can produce isogonal ( vertex-transitive ) intermediate icosagram forms with equally spaced vertices and two edge lengths.
4.
Four new prefixes were added to cover the same range of units as in 1793 ( milligram, centigram, decigram, gram, decagram, hectogram, kilogram, myriagram ).
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