If a rectangle is not a square, what is the greatest number of lines of symmetry that can be drawn?

Answer 1

You can draw 4 lines of symmetry: 1 through each diagonal, one cutting in half vertically, and another cutting in half horizontally.

Answer 2

Number of lines of symmetry: How many ways you can fold the figure along any line so that the two halves are mirror images of each other.

For a rectangle you will be able to fold it two different ways, length-wise and width-wise.