A diagonal in a shape is a straight line from one vertex to another vertex (corner).
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A diagonal has no shape, it is a straight line between the angles of a multi-sided figure.
No one answer, since it depends on the shape of the 400 square foot figure. If it is a square 20x20, then the diagonal is about 28.25 ft.
A symmetrical shape is a shape that, if you draw a straight line from one point of it to the other, will cut the shape exactly in half so that the same image is on both sides. For example, if you cut a perfect square in half from top to bottom, or side to side, or diagonal to diagonal, both sides are symmetrical.
The diagonal is 20 units.
A diamond is not a rigid shape unless it has a brace. A brace is a diagonal line you put inside shapes to make them rigid. Triangles are rigid so if you put a brace in a square to make two triangles the square is now rigid.