1. くきり、ぶぶん   convex   polygon   segment   rhombus   Hint Half-n-half Clue   2. りょうけい、はすほうけい   ray   oval   rhombus   vertex   Half-n-half Clue   3. しかっけい   segment   quadrangle   parallelogram   polygon   Half-n-half Clue   4. すいせん   heptagon   perpendicular lines   convex   quadrangle   Half-n-half Clue   5. へいめん   plane   hemisphere   ray   heptagon   Half-n-half Clue   6. たかっけい   polygon   heptagon   ellipse   hemisphere   Half-n-half Clue   7. ちょくせん   straight line   hemisphere   vertex   parallelogram   Half-n-half Clue