1980 Canadian MO Problems/Problem 5
Problem
A parallelepiped has the property that all cross sections, which are parallel to any fixed face , have the same perimeter as . Determine whether or not any other poyhedron has this property
A parallelepiped has the property that all cross sections, which are parallel to any fixed face , have the same perimeter as . Determine whether or not any other poyhedron has this property
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