A pyramid.
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A geometric figure with a polygonal base and triangular sides is called a pyramid.
A pyramid
A triangular pyramid is usually called a tetrahedron; its base is an equilateral triangle, as are the other three of its sides. An Egyptian pyramid has a square base; the other four sides are isosceles triangles.
It is a tetrahedron, which is defined as a four- sided figure with all triangular sides.
it's a pyramid with 5 sides.