How many lines of symmetry do rectangles have?

Its 4 just like a square

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No it is not. The diagonals of a square are lines of symmetry; not so with a rectangle. So there are only 2 lines of symmetry.

In theory, the statement made by the User above^^^ is true, but when it comes to the decisive moment where one has to create structures, or anything that might save or take away lives, that fails... In a rectangle, if you make diagonals, the rectangle will be split into 2 equal length, equal size, right triangles. These people have made the common misconception of trusting a textbook entirely for their answers. Textbooks are written by humans, and humans make mistakes. If everyone understood this, 9/11 never would have happened.