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MATH / How many interior diagonals does a regular nine-sided polygon have? (An…

Problem

Answer published by the source. Consult the official source to check your work against its answer.

problem

How many interior diagonals does a regular nine-sided polygon have? (An $\emph{interior diagonal }$ is a segment connecting two vertices which do not have an edge between them.)
Plain-text mathematical notation (without MathML)
How many interior diagonals does a regular nine-sided polygon have?  (An $\emph{interior diagonal }$ is a segment connecting two vertices which do not have an edge between them.)
Original LaTeX notation
How many interior diagonals does a regular nine-sided polygon have?  (An $\emph{interior diagonal }$ is a segment connecting two vertices which do not have an edge between them.)

level

Level 4

type

Prealgebra

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Source and history

Official source

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