Many different types, but mostly equilateral triangles.
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There are 4 triangles that make up a pyramid. 4 on the sides and on the bottom a square or rectangle.
The only thing I can come up with would be a tetrahedron. You could make a pyramid with a square (open) base, I guess.
An octagonal pyramid has 9 vertices. The base of this shape is an octagon, which will give it 8 vertices when the triangles that form the sides are considered. Those triangles will lead up to the apex (top) of the pyramid, and that will be the 9th vertex.
pentagons and triangles-if i'm right, you get to answer this :Dwhat is a+b(4-2)if a=-6, if b=8it's easy, dont worry.
triangles