For a polygon with an odd number of sides, such as a 9-sided shape, the axis of symmetry is a line that passes through the center of the shape and divides it into two equal halves. In the case of a regular 9-sided shape (also known as a nonagon), the axis of symmetry would pass through the center and connect opposite vertices. This axis of symmetry creates two mirror-image halves that are identical in shape and size.
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A nine sided 2-D shape (a nonagon) need not have any symmetry. It can have 1, 3 or 9 axes of symmetry: in each case from a vertex to the middle of the opposite side.
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The name of a 9 sided polygon is Nonagon.
The name of a 9 sided polygon is nonagon or enneagon.
there is 9 planes of symmetry in a cube
Any regular polygon of n sides, has an order of symmetry of n. Therefore, since a nonagon has nine sides, a nonagon has an order of symmetry of 9.