1. plane   purizumu   kousen,rei   shikakkei   heimen   Hint Half-n-half Clue   2. parallel lines   oumen   hankyuutai   fuchi、hashi   heikousen   Half-n-half Clue   3. oval   gokakkei   rankei   ryoukei、hasuhoukei   shichikakkei   Half-n-half Clue   4. polygon   ryoukei、hasuhoukei   totsumen   purizumu   takakkei   Half-n-half Clue   5. pyramid   hankyuutai   rokkakei   rankei   piramiddo   Half-n-half Clue   6. ellipse   rokkakei   chouen   oumen   totsumen   Half-n-half Clue   7. perpendicular lines   shihenkei   takakkei   rokkakei   suisen   Half-n-half Clue