because of its main structure and build up
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Square Pyramid, Cube, Triangular Prism, Sphere, Cylinder, Rectangular Pyramid, Rectangular Prism, Cone.
sphere: 0 edgescone: 1 edgerectangular prism: 8 edgescylinder: 0 edgestriangular prism:6 edgespentagonal prism: 10 edgestriangular-based pyramid: 4 edgessquare-based pyramid: 5 edges
a square a rectangle and a parallelogram
The volume of the pyramid and cone is one third the volume of the corresponding (ie same [size] base and height) prism and cylinder.
Any kind of cube, prism, or pyramid (other than a circular prism a.k.a a cylinder or a circular pyramid a.k.a. a cone)