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Thus we speak of a pentagon but not of a tetragon or a trigon, although both words are correct in form.

Thus, when the three superior planets met in Aries, Leo, or Sagittarius, they formed a fiery trigon; when in Cancer, Scorpio, and Pisces, a watery one.

In Figure 74 is a trigon, the angles at its centre being 120, and the angle at the circumference being 60, as marked.

The fourth conjunction in this trigon took place in 1663, in Sagittarius, again opposite to the ascendant of London.

Of nouns in on, derived from Greek, the greater part always form the plural regularly; as, etymons, gnomons, ichneumons, myrmidons, phlegmons, trigons, tetragons, pentagons, hexagons, heptagons, octagons, enneagons, decagons, hendecagons, dodecagons, polygons.