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No. The Louvre is a normal, rectangular building. The Pyramide du Louvre, which is outside the main Louvre building is a square based pyramid.
A triangular pyramid has 4 triangular sides.A rectangular pyramid has 4 triangular sides and 1 rectangular side.
square pyramid
A triangular pyramid.
YesA triangular pyramid is a pyramid having a triangular base. The tetrahedron is a triangular pyramid having congruent equilateral triangles for each of its faces.