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they are both 3D but different shapes
a pyramid is a 3D objecta triangle is a 2D object
They are totaly differant shapes all together. A cube is like a 3D square, a rectangular prism is like a 3D rectangle.
length times width i think* * * * *There are different formulae for calculating the surface areas of different 3D figures. If the 3D figure is a polyhedron, then each face is a ploygon and you can use the various formulae to calculate the area of each face and then add them together.There are straightforward equations for ellipsoids, and members of the conic family but other 3D shapes have more complicated formulae.
A 2D shape is flat and only has a surface area whereas a 3D shape is an object that has surface area and volume.