The shape descibed is not a symmetric figure. If it is folded on the diagonal line described, then the corners would stick off the sides. If the question is implying that they want to fold it in a differant way, then it would not be symmetrical because of the line. The line would not be in the place on both sides.
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A symmetric figure is a figure that is symmetrical. This means that if you fold it in half that both sides will line up. I hope this helped you! :)
Yes, it is the line connecting opposite corners.
No. The diagonal through a rectangle can be computed via the Pythagorean theorem: c2 = a2 + b2 where c is the diagonal length and a and b are the horizontal and vertical lengths of the rectangle.
The diagonal length is about 18.44 inches.
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. :)