A cube has three planes of symmetry.
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There are 3 planes of symmetry in a rectange.
3
A pentagonal prism has 5 planes of symmetry. This is because it can be divided into 5 identical sections by planes passing through the center of the prism and perpendicular to its bases. Each of these planes divides the prism into two equal halves that are mirror images of each other.
There are 3 lines of symmetry ina 6-sided shape.
No 3D shape with FLAT SIDES has exactly 3 faces. 4 is the minimum.