1. straight line   rankei   shikakkei   takakkei   chokusen   Hint Half-n-half Clue   2. rhombus   suisen   piramiddo   ryoukei、hasuhoukei   chokusen   Half-n-half Clue   3. concave   oumen   totsumen   kousen,rei   ryoukei、hasuhoukei   Half-n-half Clue   4. quadrangle   totsumen   kousen,rei   shikakkei   touchou   Half-n-half Clue   5. convex   shikakkei   totsumen   kukiri,bubun   shichikakkei   Half-n-half Clue   6. perpendicular lines   purizumu   chokusen   kousen,rei   suisen   Half-n-half Clue   7. hexagon   oumen   rokkakei   heikoushihenkei   chokusen   Half-n-half Clue