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When did you learn arc system and angle system?
Compulsory Four

The radian system before the new college entrance examination was in the second quarter of chapter 1 of compulsory four, and now it is compulsory four after the new college entrance examination, or the content of the second quarter of chapter 1. The concept of radian system is a relatively simple way to describe the angle, which needs to be transformed with the degree and time, and it is a compulsory content of the college entrance examination.