What is the perimeter of rhombus wxyz?

units
12 units
units
20 units

Let O be the intersection of the vertical line through ZX, and the horizontal line through YW. 

The coordinates of this point are clearly (5, 2) as it is at the same x-coordinate as X and Z, and y-coordinate as Y and W.

So, YZO is a right triangle. By the Pythagorean theorem:

.

Since all sides of a rhombus are equal, then the perimeter is :

                                units.

third choice.

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