The base is different. A rect. pyramid has a rectangle as a base. Because the sides are different length for a rectangle, the triangles will not all be congruent (equal).
A square pyramid has a square as the base. All sides of the square are the same length, so all the triangular sides of the pyramid will be congruent.
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All the large pyramids in Egypt, Mexico, etc are all rectangular pyramids. All have a square or rectangular base and four triangular sides meeting at a point. ■
Rectangular pyramids and triangular pyramids both have triangular faces.
They are polyhedra.
A rectangular pyramid is a solid (3-dimensional) figure that comes to a point opposite the base (like the Pyramids of Egypt.) Its base is a four-sided plane figure with right angles and opposite sides equal (a rectangle--or square for that matter).