The regular cutting method (Chongqing dialect pronunciation) used in architecture is Pythagorean theorem. Can you elaborate on how to use and operate it in practice?

You mean the teaching party? Generally, there are two ways to check the line on the construction site.

First: find a wide bay and measure two diagonal lines directly. If the diagonals are the same size, then they are squares.

Second: Measure 3(30) cm and 4 (40) cm on both sides of the angle line (90-degree angle) with a box ruler, and then measure the distance between these two marks. If the distance is 5(50) cm, then the angle is 90 degrees, which is a square.

Expect to adopt with pure hands