What is the surface area of the visible sides of a rectangular pyramid?
The number of visible sides if one if viewed from the front or side. The elevation from an angular position would give two face whereas all four triangular faces will be visible from above. So the answer will depend on the viewing position. In every case, the dimensions of the triangles would be required to find the visible surface area.
The difference in a triangular and rectangular pyramid only has to do with the base of the pyramid, which in turn decide how many sides the pyramid will have. A triangular pyramid has a base shaped like a triangle, which ends up having a total of 4 sides (including the base itself). A rectangular pyramid has a rectangular base, which ends up having a total of 5 sides (including the base itself).