To accurately cut a 45-degree angle by hand, you can use a combination square or a miter box. First, mark the starting point of the cut on the material. Then, set the angle on the square or miter box to 45 degrees and align it with the mark. Hold the square or miter box firmly in place and carefully cut along the marked line using a saw. Make sure to follow the angle guide closely to achieve a precise 45-degree cut.
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