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What are the error-prone points of the "quadrilateral" of mathematics in the senior high school entrance examination?
The mistake-prone point is that the theorem is not clearly remembered. For example, a parallelogram means that two groups of opposite sides are parallel, or a group of opposite sides are parallel and equal. Some students confuse it and think that two groups of opposite sides are equal to a parallelogram. This is not right, we must strictly follow the teaching materials, and we cannot take it for granted.