In factory production, it is often the case that the geometrical drawing method is used to equalize the circumference and the dimensional accuracy is not required. Therefore, it is necessary to explain the error, scope of application and precautions of the geometric drawing method, so that everyone can use it correctly. The geometrical mapping method of the circle of 3 equal parts, 4 equal parts and 6 equal parts is an accurate drawing method, and there is no theoretical error, so this article will not discuss it.
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