octagonal pyramid :)
triangular prism triangular prism * * * * * The correct answer is an octagonal pyramid.
4 the base and 3 sides
A pyramid
With a triangle base there are four sides including the base
Tetrahedron, Hexahedron(cube), Octahedron, Dodecahedron, and Icosahedron
square pyramid
There is a contradiction in your question. If the base has four equal sides then is it a square so not all the faces are Triangles. However if the base is a square and the rest of the faces are triangles then your object is a "Square-based Pyramid"
an octagon
The answer is a pyramid.
A pyramid.
An octagonal pyramid.
An octagonal pyramid
The answer to your question, is an Octahedron.
A regular octagonal pyramid.
The figure is a pyramid and the base is a square.
This object is called an octahedron
octagonal pyramid