常用π值口算练习
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1π
=3.14
2π
=6.24
3π
Baidu Nhomakorabea
=9.42
4π
=12.56
5π
=15.7
6π
=18.84
7π
=21.98
8π
=25.12
9π
=28.26
10π
=31.4
11π
=34.54
12π
=37.68
13π
=40.82
14π
=43.96
15π
=47.1
16π
=50.24
18π
=56.52
2²π=4π= 12.56 3²π=9π= 28.26 4²π=16π= 50.24 5²π=25π=78.5 6²π=36π=113.04 7²π=49π=153.86 8²π=64π= 200.96 9²π=81π= 254.34 10²π=100π=314
7²π= =153.86 49π
8²π= =200.96 64π
9²π= =254.34 81π
常见的π值【一】 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 12π= 37.68 14π= 43.96 15π= 47.1 16π= 50.24 18π= 56.52 19π= 59.66 20π= 62.8 24π= 75.36 25π=78.5 32π=100.48 36π=113.04 64π= 200.96 81π= 254.34
20π
=62.8
25π
=78.5
30π
=94.2
36
=113.04 π
49
=153.86 π
64π
=200.96
81
π
=254.34
100
π
=31.4
2²π=
4π
=12.56
3²π=
9π
=28.26
4²π=
16π
=50.24
5²π=
25π
=78.5
6²π=
36
=113.04 π
=3.14
2π
=6.24
3π
Baidu Nhomakorabea
=9.42
4π
=12.56
5π
=15.7
6π
=18.84
7π
=21.98
8π
=25.12
9π
=28.26
10π
=31.4
11π
=34.54
12π
=37.68
13π
=40.82
14π
=43.96
15π
=47.1
16π
=50.24
18π
=56.52
2²π=4π= 12.56 3²π=9π= 28.26 4²π=16π= 50.24 5²π=25π=78.5 6²π=36π=113.04 7²π=49π=153.86 8²π=64π= 200.96 9²π=81π= 254.34 10²π=100π=314
7²π= =153.86 49π
8²π= =200.96 64π
9²π= =254.34 81π
常见的π值【一】 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 12π= 37.68 14π= 43.96 15π= 47.1 16π= 50.24 18π= 56.52 19π= 59.66 20π= 62.8 24π= 75.36 25π=78.5 32π=100.48 36π=113.04 64π= 200.96 81π= 254.34
20π
=62.8
25π
=78.5
30π
=94.2
36
=113.04 π
49
=153.86 π
64π
=200.96
81
π
=254.34
100
π
=31.4
2²π=
4π
=12.56
3²π=
9π
=28.26
4²π=
16π
=50.24
5²π=
25π
=78.5
6²π=
36
=113.04 π