1. lignes parallèles   parallel lines   ellipse   concave   straight line   Hint Half-n-half Clue   2. Heptagon   prism   segment   heptagon   rhombus   Half-n-half Clue   3. parallélogramme   parallelogram   hexagon   rhombus   ray   Half-n-half Clue   4. plat   straight line   plane   ray   quadrangle   Half-n-half Clue   5. hexagone   hexagon   pentagon   straight line   heptagon   Half-n-half Clue   6. ovale   oval   quadrilateral   straight line   pentagon   Half-n-half Clue   7. pentagone   prism   pentagon   parallelogram   quadrangle   Half-n-half Clue