1. chouen   parallelogram   parallel lines   perpendicular lines   ellipse   Hint Half-n-half Clue   2. rokkakei   oval   pentagon   hexagon   parallelogram   Half-n-half Clue   3. gokakkei   pentagon   prism   quadrilateral   vertex   Half-n-half Clue   4. hankyuutai   ray   segment   pyramid   hemisphere   Half-n-half Clue   5. ryoukei、hasuhoukei   ellipse   hexagon   ray   rhombus   Half-n-half Clue   6. rankei   plane   pentagon   oval   ray   Half-n-half Clue   7. heikousen   parallel lines   edge   segment   hemisphere   Half-n-half Clue