1π=3.14,2π=6.28,3π=9.42,4π=12.56,5π=15.7,6π=18.84，7π=21.98,8π=25.12,9π=28.26,10π=31.4
1兀＝3.14 2兀＝6.28 3兀＝9.42 4兀＝12.56 5兀＝15.7 6兀＝18.84 7兀＝21.98 8兀＝25.12 9兀＝28.26 10兀＝31.4
