Math Shape Double Bubble Map
Here is a math shape double bubble map, from which you can see there are pyramids and prisms have been selected to compare. They are all polyhedron and 3D model. However, the prisms are pair of congruenal polygonal faces that are parallel, and their remaining faces are parallelograms. By compared, the pyramids are one polygonal base, and remaining faces are triangles that share a common vertex.
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