常见圆周率
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1π =3.14 11π =34.54 21π =65.94
2π =6.28 12π =37.68 22π =69.08
3π =9.42 13π =40.82 23π =72.22
4π =12.56 14π =43.96 24π =75.36
5π =15.7 15π =47.1 25π =78.5
6π =18.84 16π =50.24 26π =81.64
7π =21.98 17π =53.38 27π =84.78
8π =25.12 18π =56.52 28π =87.92
9π =28.26 19π =59.66 29π =91.06
10π =31.4 20π =62.8 30π =94.2
wenku.baidu.com
2π =6.28 12π =37.68 22π =69.08
3π =9.42 13π =40.82 23π =72.22
4π =12.56 14π =43.96 24π =75.36
5π =15.7 15π =47.1 25π =78.5
6π =18.84 16π =50.24 26π =81.64
7π =21.98 17π =53.38 27π =84.78
8π =25.12 18π =56.52 28π =87.92
9π =28.26 19π =59.66 29π =91.06
10π =31.4 20π =62.8 30π =94.2
wenku.baidu.com