"other" in the question implies that you already have a partial list. It is not possible to answer the question without knowing what is already on the list.
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Triangular based Pyramid
A point. Other shapes may not have straight sides but that does not mean that they do not have sides.
Polygons are 2D plane figures. All polygons with 7 sides would be classified as heptagons.
The names of shapes based on the number of sides up to 10 are as follows: Triangle (3 sides) Quadrilateral (4 sides) Pentagon (5 sides) Hexagon (6 sides) Heptagon (7 sides) Octagon (8 sides) Nonagon (9 sides) Decagon (10 sides)
Two shapes are similar when the sides of one are directly proportional to the corresponding sides of the other. That all the corresponding angles are equal.