There are infinite planes of symmetry in a cylinder in the same way that a circle has infinite lines of symmetry.
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two of the faces of a cylinder are circles circles have an infinite number of lines of symmetry therefore cylinders have an infinite number of planes of symmetry
Oh, dude, a cylinder has infinitely many lines of symmetry. Yeah, that's right, infinitely! So, like, you can keep turning it and it'll look the same from all angles. It's like the gift that keeps on giving... symmetry!
there is 9 planes of symmetry in a cube
it has 5 planes of symmetry
A rectangular solid that is not a cube has 3 planes of symmetry.