A rectangle is a parallelogram containing four right angles. Opposite sides (a = c, b = d) are equal and the perimeter is the sum of the lengths of all sides (a + b + c + d) or, comonly, 2 x length x width. The area of a rectangle is length x width. A **square** is a rectangle with four equal length sides. The perimeter of a square is 4 x length of one side (4s) and the area is the length of one side squared (s^{2}).

If the area of this square is 25, what is the length of one of the diagonals?

3\( \sqrt{2} \) | |

8\( \sqrt{2} \) | |

6\( \sqrt{2} \) | |

5\( \sqrt{2} \) |