The cube
ABCDA'B'C'D' has side-length 1. ABCD and A'B'C'D' are
parallel faces. The circular cylinder whose bases are the discs inscribed in
the squares ABCD and A'B'C'D' is denoted K1. The faces ABA'B' and
CDC'D' are also parallel. Denote by K2 the cylinder whose bases are the
discs inscribed in ABA'B' and CDC'D'. The solid
is the
union of the two cylinders. (Each cylinder is a subset of the Euclidean
space and hence one can consider their union). Find the volume of S.
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