Inspired by Dinesh Nath Goswami
Geometry
Level
3
In an octahedron, what is the angle (in degrees) between 2 edges that meet at a vertex, but are not adjacent?
Image credit: Wikipedia Cyp
105
None of the rest
90
135
75
60
120
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1 solution
Look down the long diagonal of the octahedron--you see a square. Symmetry makes this a necessary fact.