it is a pyramid
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3. You wanna know how?? First there are 3 triangles that touch the base, so there are only 3 lateral faces. :)
There would be one face for each side of the square. The answer is four if you or only counting the triangular faces. It would be five if you are including the square base. * * * * * One square base and four triangular faces (that meet at an apex above the base).
A tetrahedron.
Not true. They have only one base and several (3 or more) lateral triangular faces. A pyramid has a single vertex over a base - there are no parallel faces in any pyramid.
A sphere has no base, and since it has no base, it has only a surface area and no lateral area.