This calculator determines the nth decagonal number

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- decagon
- 10 sided polygon or 10-gon
- decagonal number
- 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.
- 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.
- polygon
- A plane figure bounded by a set of straight lines