alleryMirror planes cut a cube into matching halves. How many such planes exist?
AThree
BSix
CNine
DTwelve
Answer & Solution
Correct answer: C. Nine
1. Three planes are parallel to the faces, each halving the cube between opposite faces.
2. Six more planes pass diagonally through opposite edges.
3. Together this makes nine planes, so three or six undercount.
_Source: Wikipedia, Reflection symmetry, section Symmetric geometrical shapes_
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