1. りょうけい、はすほうけい   heptagon   straight line   convex   rhombus   Hint Half-n-half Clue   2. はんきゅうたい   ray   hemisphere   concave   convex   Half-n-half Clue   3. ごかっけい   segment   pentagon   quadrangle   parallelogram   Half-n-half Clue   4. こうせん   ray   parallelogram   oval   polygon   Half-n-half Clue   5. とうちょう   quadrangle   concave   parallel lines   vertex   Half-n-half Clue   6. へいこうしへんけい   parallelogram   pentagon   hexagon   hemisphere   Half-n-half Clue   7. しちかっけい   heptagon   ray   ellipse   quadrangle   Half-n-half Clue