A pyramid has a variable number of triangular faces. The base of a triangle can be practically any regular shape, starting with a triangle. Technically a pyramid can have four or more triangles as faces.
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the answer is pyramid
3
One square and four triangles.
There are 4 triangles that make up a pyramid. 4 on the sides and on the bottom a square or rectangle.
Many different types, but mostly equilateral triangles.