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A paragraph?!?
Because perimeter means outside.
No because diagonal lines do not count. Even though they might fit perfectly inside the rectangle, but those don't count. Only lines going horizontally or vertically count as lines of symmetry. :)
Yes. For example, if a email account can only be 12 characters long, spaces would count as a character.
Fold (or pretend to fold) an object in half in different ways, and if the edges and corners match exactly up to each other, that is a line of symmetry. If you want to count all the lines of symmetry, use the method above but tally the amount of lines of symmetry you count.