This type of problem involves relationships between the

length and width and/or connections between the length, width, and diagonal of a rectangle. With information about the

area or perimeter, we can set up equations that allow us to find the rectangle's

length and width. Once these are known, we can use the formulas for

area and perimeter.

Sometimes there is a need to use the

Pythagorean Theorem to relate the length, width, and diagonal. It is important to take note of the fact that the diagonal is always the

hypotenuse of this right triangle.