求1π ~50π（π就算3.14）

1 3.14
2 6.28
3 9.42
4 12.56
5 15.7
6 18.84
7 21.98
8 25.12
9 28.26
10 31.4
11 34.54
12 37.68
13 40.82
14 43.96
15 47.1
16 50.24
17 53.38
18 56.52
19 59.66
20 62.8
21 65.94
22 69.08
23 72.22
24 75.36
25 78.5
26 81.64
27 84.78
28 87.92
29 91.06
30 94.2
31 97.34
32 100.48
33 103.62
34 106.76
35 109.9
36 113.04
37 116.18
38 119.32
39 122.46
40 125.6
41 128.74
42 131.88
43 135.02
44 138.16
45 141.3
46 144.44
47 147.58
48 150.72
49 153.86
50 157