It would be a rectangle when you look from the top.
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A rectangular pyramid is a pyramid with a rectangular base. Thus, a top-down view of such an object would simply be a rectangle with two diagonal lines connecting opposite vertices.
The shape is 3 dimensional, the top down view is 2 dimensional.
The difference is 90 degrees.The side view looks like a triangle.The top view looks like a rectangle with its diagonals.
Unlike a tetrahedron (a four-faced shape with all triangular faces), a pyramid has a square (or rhomboid) base and triangular sides. Thus, a view from any side will yield a triangular appearance, while a view from below or above shows a square or rectangular shape.
Rectangular pyramid.