HEPTAGONAL

Etymology

Adjective

heptagonal (not comparable)

Having seven angles and sides.

(math, of a number) Belonging to the sequence generated by the formula \(\frac{5n^2 - 3n}{2}\).

Anagrams

• paleognath

Source: Wiktionary


Hep*tag"o*nal, a. Etym: [Cf. F. heptagonal.]

Definition: Having seven angles or sides. Heptagonal numbers (Arith.), the numbers of the series 1, 7, 18, 34, 55, etc., being figurate numbers formed by adding successively the terms of the arithmetical series 1, 6, 11, 16, 21, etc.

Source: Webster’s Unabridged Dictionary 1913 Edition



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