8(top)+8(bottom)+8(sides)=24
24 edges(sides)
four!
5....
You add up all the sides and you should get 5!
It depends on a decagonal what. There will be different answers for a decagonal pyramid, prism, dipyramid, etc.
12
6
12 vertices
6 faces
A pentagon has got 5 sides ,a hexagon has got 6 side's octagon has got 8 sides.
you got it, a cube. it is not a hexahedron because that could be two 3-point pyramids on end. It isn't a rectangular prism either because a prism isn't always square on all sides
A hexagon has 6 sides.
An octagon doesn't have any faces: faces only apply to 3-dimensional objects. If you meant edges, or sides, an octagon has eight. If you meant an octagonal prism, they have ten faces.