A polygon is a closed, 2-dimensional (planar) shape made up of three or more straight line segments connected end to end to end.
By this definition, triangles, quadrilaterals and pentagons are all examples of polygons. Circles (etc.) are not, as they are not composed of (straight) line segments. Note that the shape can be convex (which we're used to) or concave, meaning that all the straight line segments may not lie along a "perimeter" but can "go inside" and "come back out" to form the shape.
A plane figure with at least three straight sides and angles, and typically five or more.
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it seems to me that the only polygon of your description is a square
A type of polygon is a rhombusial polygon, trysectalnict polygon, and a equilateral polygon.
A triangle (not traingle) is a polygon. It can be a regular polygon but need not be.
an arrow is or isn't a polygon?
Polygon B is an octagon.