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.
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.
Regular hexagons and other shapes based on hexagons. Polygons with 6k sides (positive integer k) where sets of k adjacent sides and angles are congruent to the next set, and other shapes based on these.
Heptagon.
A heptagon.
A septagon or a heptagon
Triangular based Pyramid
Most triangles, quadrilaterals, and other polygons with five or more sides; most closed shapes with curved sides.Most triangles, quadrilaterals, and other polygons with five or more sides; most closed shapes with curved sides.Most triangles, quadrilaterals, and other polygons with five or more sides; most closed shapes with curved sides.Most triangles, quadrilaterals, and other polygons with five or more sides; most closed shapes with curved sides.
A point. Other shapes may not have straight sides but that does not mean that they do not have sides.
7 Sides on a Twenty Pence Piece
Polygons are 2D plane figures. All polygons with 7 sides would be classified as heptagons.
Other hexagons.
Retangles, squares, parralelegrams and various other shapes
Any regular polygon with 5, 7 or more sides.
Of some shape, Yes. Of other shapes, No.