A 9 sided polygon is a nonagon
Its exterior angles add up to 360 degrees
Its interior angles add up to 1260 degrees
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Also the sides of a nine sided figure can not be sold separately.
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A nine sided plane figure is a nonagon. A nine sided three dimensional figure is a nonahedron.
nine sided figure = nueve figura una cara nonagon = nonágono
A polygon with n sides has n*(n-3)/2 diagonals. Simple as that. So a 9 sided polygon has 9*6/2 = 27 diagonals.
Nine-sided closed figure
A nine sided POLYGON is called a nonagon. Any plain shape bounded by nine straight sides is a nonagon.