Enter nonagonal number statement

Calculate nonagonal number 45
Nonagonal numbers form equally spaced points.
The points form a nonagon.

Nonagonal Number Formula

N_n =	n(7n - 5)
	2

N₄₅ =	45(7(45) - 5)
	2

N₄₅ =	45(315 - 5)
	2

N₄₅ =	45(310)
	2

N₄₅ =	13950
	2

N₄₅ = 6,975

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N_n = n(7n - 5)/2

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figurate number: a number that can be represented by a regular geometrical arrangement of equally spaced points. If the arrangement forms a regular polygon, the number is called a polygonal.
formula: a fact or a rule written with mathematical symbols. A concise way of expressing information symbolically.
nonagon: 9 sided polygon or 9-gon
nonagonal number
number: an arithmetical value, expressed by a word, symbol, or figure, representing a particular quantity and used in counting and making calculations and for showing order in a series or for identification. A quantity or amount.