Describe two method for testing that a frame in the cramps is square?

To test if a frame in a cramp is square, one method is the "3-4-5 triangle" rule, where you measure 3 units along one side, 4 units along the adjacent side, and check if the diagonal between these two points measures 5 units. Another method is the use of a carpenter's square; by placing the square in the corners of the frame, you can visually inspect if both sides meet at a perfect right angle. Both methods ensure that the frame is properly squared for accurate assembly.