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对于每一位高中学生来说,圆的面积公式再熟悉不过了,甚至有的学生能够倒背如流。但若是要证明这个公式,可能就不是每位学生都能办到。
For every high school student, the formula for the area of the circle is familiar, and even some students can go backwards. But if you want to prove this formula, maybe not every student can do it.