A 9 sided polygon is a nonagon
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A polygon with 9 sides and 9 vertices is a nonagon
7 sides heptagon 9 sides nonagon
A nonagon is a polygon that has 9 sides and 9 angles
A shape with 9 sides, is a nonagon.
The equation is 12y - 9 = 21. To solve for y, you can start by adding 9 to both sides to isolate the term with y. This gives you 12y = 30. Next, divide both sides by 12 to solve for y, which gives y = 2.5.