要将这个公式转换为一个表达式，你需要使用变量来记录半径及周长。
To translate this formula into an expression, you would use variables to record the radius and circumference.
要将这个公式转换为表达式，你需要使用变量来记录半径及周长。
To translate this formula into a expression, you would use variables to record the radius and circumference.
您可以保持和更新记录和预览结果的计算公式。
You can maintain and update records and preview the results that are derived.
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