八边形计算器
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周长 = 8*side；面积 = 8*side**2/(4*tan(pi/8))
- side
- 边长 · m
- pi
- 3.141592653589793
Enter values to see results and the formula.
Example values are ready
Review the inputs, then select Calculate.周长 = 8*side；面积 = 8*side**2/(4*tan(pi/8))