圆计算器
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Review the inputs, then select Calculate.Calculation formula
直径 = 2*r；周长 = 2*pi*r；面积 = pi*r**2
- r
- Radius · m
- pi
- 3.141592653589793
Enter values to see results and the formula.
Example values are ready
Review the inputs, then select Calculate.直径 = 2*r；周长 = 2*pi*r；面积 = pi*r**2