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| circular constant | |||
| ratio of circumference | |||
| piπ | |||
| ratio of the circumference of a circle to it's diameter | |||
| pi (π) | |||
| ratio of the circumference of a circle to its diameter | |||
| |||
| ratio of circumference to diameter (π) | |||
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| pi | |||
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| Ludolf s number | |||
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| circular frequency | |||
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圆周率 : 10 phrases in 6 subjects |
| Business | 1 |
| Hydroelectric power stations | 2 |
| Oil / petroleum | 1 |
| Plastics | 2 |
| Space | 2 |
| Technology | 2 |
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