1. ryoukei、hasuhoukei   edge   rhombus   oval   polygon   Hint Half-n-half Clue   2. kukiri,bubun   parallel lines   hexagon   heptagon   segment   Half-n-half Clue   3. purizumu   quadrangle   prism   oval   perpendicular lines   Half-n-half Clue   4. shihenkei   quadrilateral   pentagon   convex   ellipse   Half-n-half Clue   5. touchou   vertex   ray   pyramid   quadrangle   Half-n-half Clue   6. oumen   pyramid   ray   hexagon   concave   Half-n-half Clue   7. fuchi、hashi   edge   vertex   straight line   ellipse   Half-n-half Clue