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An equilateral parallelopiped, each of whose face is a rhombus.
Proper fractions have a numerator whose face value is less than the face value of the denominator. 4/5 is a proper fraction, whereas 5/4 is not.
The number 1. 1 in the one's place equals 1.
It can, but only if it a right triangular prism one of whose faces exactly matches the face of the square.
For every polyhedron, there is a dual which is a polyhedron that has:a face where the first had a vertex,a vertex where the first had a face,the same number of edges.A self-dual polyhedron is a polyhedron whose dual is the same shape.All pyramids, for example, are self-dual.