1. It is necessary to clearly grasp the meaning (definition), classification and positional relationship of angles and line segments.

2.

geometric figure

The problem (finding the size of angle and the length of line segment) can be solved by column equation.

3. Do more exercises and open your mind.

4. Understanding is the best memory, and there is no need to remember theorems and formulas.

5. Remember: Without corners and line segments, the answer is often not unique.

Finally: after you get the question, you should not only look at it, but also do it. Only by doing this can we have the idea of solving the problem.