1. concave   concave   plane   hexagon   hemisphere   Hint Half-n-half Clue   2. Heptagon   quadrangle   heptagon   parallel lines   straight line   Half-n-half Clue   3. rebord   oval   pentagon   edge   ray   Half-n-half Clue   4. parallélogramme   segment   parallelogram   ray   polygon   Half-n-half Clue   5. ovale   oval   prism   heptagon   parallelogram   Half-n-half Clue   6. pentagone   segment   rhombus   pentagon   hexagon   Half-n-half Clue   7. hémisphère   heptagon   ray   ellipse   hemisphere   Half-n-half Clue