Quadrilateral

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 * Quadrilateral... ** a four-sided polygon; examples include squares, rectangles, parallelograms, trapezoids, etc.

There are special types of quadrilateral:

Since a square is both a rectangle and a rhombus, you have a choice of methods. 

Option 1

 * 1) 1**Identify the length of one side**. (If you start with perimeter, divide by 4.)
 * 2) 2**Square it**.

Option 2
these are types of qadrilateral s
 * 1) 1 ** Identify the length of the diagonal **.
 * 2) 2**Square it**.
 * 3) 3**Divide by 2**.