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What does polyhedral mean?
It's the adjective form of the word polyhedron, which means a solid figure with many plane faces, typically more than six.
Is a decahedral die a regular polyhedral?
NO
What are faces of a geometric object?
They are the plane surfaces which are bounded by edges of a solid object.
What 3-d shape has 4 fewer faces than a cube?
There is no polyhedron that meets these requirements. But there are many possible non-polyhedral shapes: for example, a hemisphere, a cone, a torus (doughnut) sliced by a plane perpendicular to its axis.
What is a plane?
A plane has several quite different meanings. A plane isA tree, otherwise known as a SycamoreA flat surface, more often conceptual than physicalA tool for smoothing a piece of woodOne of the lifting surfaces of an airplane - usually the tail-plane (aka horizontal stabiliser) or the wing (sometimes called main-plane)A level of thought or existenceA short form of airplane (q.v.). Strictly this one should be written 'plane not plane.
