How do you layout a 45 degree angle on a 10 inch pipe to torch cut for welding?

To layout a 45-degree angle on a 10-inch pipe for torch cutting, first measure and mark the midpoint of the pipe's diameter (5 inches). Then, use a protractor or a framing square to locate the 45-degree angle from the center point, creating a line that extends along the length of the pipe. Ensure the line is visible and straight, then proceed to torch cut along this marked line for welding. Always wear appropriate safety gear and ensure proper ventilation while cutting.