An octagon is a two-dimensional figure. It has no faces but does have 8 sides.
10 A decagon is a plane (2-d) figure and so it has only one face. It has 10 sides and 10 vertices.
Eight ( including the ends ). No but it has 6 sides
6 sides
A triangular prism.
pyramid. Base is a square, but each of the 4 sides is a triangle.
A 2-dimensional figure with 12 sides is called a dodecagon. A 3-dimensional figure with 12 sides (faces) is called a dedecahedron.
That would be a cylinder, with the faces on each end.
An octagon is a two-dimensional figure. It has no faces but does have 8 sides.
Despite the blind answer of many uneducated users of this site, a pentagon is 2 dimensional with 5 SIDES, thus not a solid figure. A pentahedron, though, is a solid figure of five FACES. PENTAHEDRON
2 dimensional (plane) figures can have three or more straight edges as sides. 3 dimensional (solid) figures can have four or more plane sides (faces). They can have fewer sides if the sides are not straight.
This question is not the clearest. However, an n-sided prism will typically have n+2 faces: the n sides, and the two ends. So a nine-sided prism will have 11 faces.
Such a figure is a triangle-based prism.
A cuboid is a 3D shape that can be a cube or a rectangle, both having 2 ends, 2 sides, and a top and a bottom face.
No sides actually but 2 faces
A triangular prism
A prism.