Nonagon (9-gon) (also Enneagon)
From Latin: nonus - "ninth"
Adjust the nonagon below by dragging any orange dot. By clicking on the top left command line,
you can switch it between a
Properties of regular nonagons
Properties of all nonagons
Number of diagonals
The number of distinct diagonals possible from all vertices. (In general ½n(n–3) ).
In the figure above, click on "show diagonals" to see them.
Diagonals of a Polygon
Number of triangles
The number of triangles created by drawing the diagonals from a given vertex. (In general n–2).
In the figure above, click on "show triangles" to see them. See
Triangles of a Polygon
Sum of interior angles
In general 180(n–2) degrees .
Interior Angles of a Polygon Related polygon topics
Types of polygon
Area of various polygon types
Perimeter of various polygon types
Angles associated with polygons
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