solve the geometry
Level
pending
What are total no. of planes of symmetry for hexagonal closed packing?
The answer is 4.
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1 solution
One plane passing through the plane of triangle located at the centre and three planes passing through the opposite edge centre of a hexagon and perpendicular to the hexagon. You can also get the second case by just making an altitude of the triangle and extending it in both upward & downward directions.