1. | 3. | 4. | ||

r = 1 Trivial. | r = 2 / √3 = 1.154+ Trivial. | r = √2 = 1.414+ Trivial. |

5. | 6. | 7. | ||

r = 1.641+ Proved by Károly Bezdek in 1983. | r = 1.798+ Proved by Károly Bezdek in 1979. | r = 2 Trivial. |

8. | 9. | 10. | ||

r = 2.246+ Proved by Gábor Fejes Tóth in 1996. | r = √2 + 1 = 2.414+ Proved by Gábor Fejes Tóth in 1996. | r = 2.532+ Found by D. Nagy in 1974. |

11. | 12. | |

r = 2.631+ Found by Hans Melissen in 1997. | r = 2.769+ Found by Hans Melissen in 1997. |

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