Advanced Geometric Problem & Solution (Twice a week update) Now 4611 problems posted.
<Solid-2025-259>, hint
Consider a box ABCDA'B'C'D' and a tetrahedron A'BC'D. Then
BD=A'C', BA'=C'D, A'D=BC' and 4 faces are congruent triangle and have equal circumradius.
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