2
A pyramid has 1 square base.
square base pyramid
An octagonal-based pyramid has a total of 10 sides. It has 8 triangular lateral faces that connect the apex to each vertex of the octagonal base, plus the 1 octagonal base itself, making it 8 + 1 = 9 sides. If considering the edges, it has 16 edges: 8 edges on the base and 8 edges connecting the apex to each vertex of the base.
Spherical
A 3D shape with one curved face is a cylinder. It has a circular base and a curved surface that connects the two bases. The curved face wraps around the side, while the top and bottom faces are flat circles.
Octagonal prism
Octagonal pyramid
cube square prism
A pyramid has 1 square base.
the cone.
pentagonal pyramid
cone
square base pyramid
An octagonal-based pyramid has a total of 10 sides. It has 8 triangular lateral faces that connect the apex to each vertex of the octagonal base, plus the 1 octagonal base itself, making it 8 + 1 = 9 sides. If considering the edges, it has 16 edges: 8 edges on the base and 8 edges connecting the apex to each vertex of the base.
Spherical
A hemisphere
A pyramid with an n-sided base will have n + 1 vertices, n + 1 faces, and 2n edges.