Septagons or heptagons are 7 sided polygons
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septagonal cons
Nine. Two heptagons (septagons) and 7 rectangles.
No. Equilateral heptagons (7 sided figures) do not tessellate the plane. Not if no other polygons are allowed. But if you allow a (non-equilateral) pentagon then you might be able to tessellate the plane!
Polygon's parts of speech are poly- (many) and -gon (a suffix describing geometrical figures contained by line segments) Therefore a polygon just means many sided figure. They include but are not limited to: Squares Rectangles Triangles Pentagons Diamonds Rhombus' Septagons And all two dimensional figures rendered with straight lines