Ah, a cuboid is a special shape with 9 lines of symmetry. Each face of the cuboid has a line of symmetry running through its center, and there are additional lines of symmetry that go through the midpoints of each pair of opposite edges. It's a beautiful thing to observe the symmetry in nature and mathematics.
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It depends on which type of cuboid we are talking about. If it is a CUBE (a special type of cuboid), then it has nine planes of symmetry. If it is a cuboid with length, width and height all different, then it has three planes of symmetry. If it is a cuboid with two equal measurements (say width and length), then it has five planes of symmetry.
10 lines of symmetry
2 lines of symmetry
There are infinitely many lines of symmetry. Every line can be a line of symmetry for a suitable shape.