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No it has 3 rectangular sides
A three-dimensional shape with eight triangular faces is called an octahedron.
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.
Hexagon
A triangular prism has a base that is a triange; a triangle has three sides.