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简介:
常用圆周率的计算
π×1=π
π×2=6.28
π×3=9.42
π×4=12.56
π×5=15.70
π×6=18.84
π×7=21.98
π×8=25.12
π×9=28.26
π×10=31.40
π×11=34.54
π×12=37.68
π×16=50.24
π×18=56.52
π×20=62.80
π×25=78.50
π×32=100.48
π×36=113.04
π×49=153.86
π×64=200.96
π×81=254.34
π×121=379.94
常用的完全平方数
1² =1
2² =4
3² =9
4² =16
5² =25
6² =36
7 ²=49
8² =64
9² =81
10² =100
11² =121
12² =144
13² =169
14² =196
15² =225
16² =256
17² =289
18² =324
19² =361
20² =400