圆周率速算
表
关于同志近三年现实表现材料材料类招标技术评分表图表与交易pdf视力表打印pdf用图表说话 pdf
3.14x2=6.283.14x2²=12.563.14x3=9.423.14x3²=28.263.14x4=12.563.14x4²=50.243.14x5=15.73.14x5²=78.53.14x6=18.843.14x6²=113.043.14x7=21.983.14x7²=153.863.14x8=25.123.14x8²=200.963.14x9=28.263.14x9²=254.343.14x10=31.43.14x10²=3143.14x11=34.543.14x11²=379.943.14x12=37.683.14x12²=452.163.14x13=40.823.14x13²=530.663.14x14=43.963.14x14²=615.443.14x15=47.13.14x15²=706.53.14x16=50.243.14x16²=803.843.14x17=53.383.14x17²=907.463.14x18=56.523.14x18²=1017.363.14x19=59.663.14x19²=1133.543.14x20=62.83.14x20²=1256圆周长的一半=πr半圆的周长=πr+2r=5.14r圆环的面积=πR²-πr²=3.14×(R+r)×(R-r)