1. oval   rankei   shichikakkei   purizumu   totsumen   Hint Half-n-half Clue   2. straight line   purizumu   shihenkei   shichikakkei   chokusen   Half-n-half Clue   3. ellipse   rankei   chouen   fuchi、hashi   kukiri,bubun   Half-n-half Clue   4. polygon   rankei   piramiddo   takakkei   kukiri,bubun   Half-n-half Clue   5. pyramid   purizumu   piramiddo   ryoukei、hasuhoukei   kukiri,bubun   Half-n-half Clue   6. prism   purizumu   suisen   hankyuutai   heikousen   Half-n-half Clue   7. heptagon   shichikakkei   chokusen   kousen,rei   kukiri,bubun   Half-n-half Clue