the names of all 3 sided objects are googoo gaagaa. and cole is sexy uhuhuhuhuh!@#$$%^^&*()_|}"{:PLKL<>:?"":L<>??:>LKJHGFDXGBHNJU"P:(&Y^HGRF
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A rhombus, an equal sided parallelogram or an equal sided quadrilateral with no right angles.
Who knows? Well, maybe me.... I think it might be a decicosagon, because I figure that all polygons from 21-30 end in icosagon, and because all the 13-20 begin with the 3-9 sided shape names.. (apart from 19, with is the enneadecagon of course) the answer will be... A. Decicosagon
A 3-sided polygon is a triangle. There is no diagonal for that shape since all non-adjacent vertices share a line segment!
A 3-sided figure is called a triangle.
We have the triangle (3-sided), square (or quadrilateral, 4-sided), pentagon (5-sided), hexagon (6-sided), heptagon (or septagon, 7-sided), octagon (8-sided), nonagon (9-sided) and decagon (10-sided) to get you started.