A square, rhombus, rectangle, any shape that has at least 3 STRAIGHT sides
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A triangle
In Euclidean geometry, a regular polygon is a polygon that is equiangular (all angles are equal in measure) and equilateral (all sides have the same length).
It looks like a square with a triangle on top of it.
A hexagon is a polygon with six sides. A snowflake is generally hexagonal.
A nonagon is a polygon with 9 sides. It looks like an octagon with one extra side.