That’s why setting your forms properly is so important, and that means making sure they are not only the right length but also the correct angles. Often the corners of a patio should be 90 degrees, or perfectly square. With a few straight-forward measurements and a little math, you can make your corners square every time.
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Measure one side of your form and make a mark exactly 3 feet from the corner.
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Measure the opposing side of the same corner and make a mark exactly 4 feet from the corner.
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Measure the diagonal distance between the two marks. If the distance is exactly 5 feet, then the corner is square. If not, move the forms farther or closer, until the diagonal measurement is exactly 5 feet.
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Repeat steps 1 through 3 for each corner of your patio, until all of them are exactly square.