The statement is true is option A - The area of Region Z is equal to 289 in^2.
True statement regarding the combined area:
Since the square regions are joined at their vertices also the combined area of the region x and region Y should be 289 so we know that the area of the square based on the hypotenuse of a right triangle should be equivalent to the sum of the areas of the squares that based on the left sides.
Therefore, the option A is correct.
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