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What is the difference about pyramid and prism?
A pyramid has one polygonal base and the rest of the faces are triangles. A prism has two congruent polygonal bases and the other faces are rectangles.
Does a triangular pyramid have triangles on all faces?
No. I has 3 triangle faces and one square face.
How many faces are in a hexagrammic pyramid?
There are 12 lateral faces (triangles) and one base so altogether there are 13 faces.
What has 8 congruent equilateral triangles as faces and 6 vertices?
A solid with 8 faces is an octahedron.As all faces are the same it is a regular octahedron.As such it is one of the five platonic solids - the only five 3D objects that can be regular: the tetrahedron (4 equilateral triangles for the faces), the hexahedron (usually called a cube with 6 square faces), the octahedron (as asked, 8 equilateral triangles for the faces), dodecahedron (12 regular pentagons as faces), icosahedron (20 equilateral triangles as faces).
What has five faces of which four faces are triangles and one face is a square all triangular faces meet at one point?
That sounds like a square-based pyramid.
