How do you cut trim for a 135 degree angle?

To cut trim for a 135-degree angle, set your miter saw to 67.5 degrees (since 180 degrees minus 135 degrees equals 45 degrees, and you split that in half). Position the trim securely against the saw's fence, ensuring the angle is oriented correctly for the desired fit. Make the cut, and repeat for the other piece of trim, adjusting the angle as needed to ensure both pieces fit together perfectly at the 135-degree angle. Always double-check your measurements before cutting to avoid mistakes.