1. sommet   convex   parallel lines   heptagon   vertex   Hint Half-n-half Clue   2. hexagone   heptagon   parallel lines   hexagon   hemisphere   Half-n-half Clue   3. rebord   polygon   quadrilateral   segment   edge   Half-n-half Clue   4. ellipse   quadrilateral   polygon   plane   ellipse   Half-n-half Clue   5. segment   segment   quadrilateral   heptagon   pentagon   Half-n-half Clue   6. hémisphère   hemisphere   pyramid   segment   convex   Half-n-half Clue   7. pyramide   concave   straight line   pyramid   hemisphere   Half-n-half Clue