octahedron
A shape that has 8 triangular faces is a octahedron.If you want to see a picture of a octrahedron here is a website.http://en.wikipedia.org/wiki/File:Octahedron.svgI had this as a maths question it was hard.
It is an octahedron which is one of the Platonic Solids having 8 equilateral triangular faces and 12 edges.
A triangular based pyramid
triangular based pyramid
A shape that has fewer than 8 faces and fewer than 10 edges is a triangular prism. A triangular prism has 5 faces (2 triangular faces and 3 rectangular faces) and 9 edges. It meets the criteria of having fewer than 8 faces and fewer than 10 edges.
An octahedron: two quadrilateral based pyramids with their bases together.
Your shape is a triangular octagon. * * * * * What on earth is that shape? The most likely answer is an octogonal pyramid.
A quadrilateral based dipyramid.
triangular prism
A Hexahedron has no triangular faces. A Tetrahedron has 4 triangular faces. A octahedron has 8 triangular faces. A Icosahedron has 20 triangular faces. By:-Cherrylvr- :)
An octahedron is a closed 3-d shape with 8 polygonal faces. There are 257 topologically different convex octahedra. An octahedron can have triangles for all eight faces or, as is the case with a hexagonal prism, not a single triangular face.