A rectangular prism, or a cuboid, has twelve edges. It also has six faces and it has eight vertices.
Pyramid: Five faces, eight edges, and five vertices. Prism: Six faces, twelve edges, and eight vertices.
Octagon.
Total Eight edges; four vertical and four at bottom.
A rectangular prism has six faces, eight vertices, and twelve edges. All of the faces are either rectangles or squares.
It is a geometric figure with eight equal sides.
Oh, dude, a rectangular block is just a solid figure with six faces that are all rectangles. It's like a box, but fancier sounding. So, if you ever need to impress someone with your knowledge of basic shapes, just throw "rectangular block" into the conversation and watch the awe in their eyes.
A square based pyramid.
It is an eight-sided figure; hence, an octagon.
A rectangular prism has six faces because it has 4 sides and two bases. It also has eight vertices and 12 edges.
A Cube/Cuboid
There are eight (8). Vertices are the corners where two edges meet.