Proving triangle congruence is a part of junior middle school proof problem. Next, I use a problem to prove the congruence of triangles to explain the standard problem-solving step format of proving the problem.

The first step is to read through the topic and get familiar with what the problem is. Then look at the chart with questions and mark the known conditions in the chart at will, so it looks clear at a glance. As shown in the figure below:

The second step is to write the steps to solve the problem after clearing your mind. In geometry problems, we must first write out the known conditions and implied conditions. Finally, the problem was solved. As shown in the figure below:

The third step is to take the conclusion of the first question as the condition of the second question, and then write out the existing conditions and processes, which is also the key to solving the problem. Finally, check it to see if it is correct. As shown in the figure below: