1. quadrilatère   pyramid   quadrilateral   perpendicular lines   hexagon   Hint Half-n-half Clue   2. polygone   concave   polygon   parallel lines   quadrangle   Half-n-half Clue   3. losange   rhombus   perpendicular lines   pyramid   parallelogram   Half-n-half Clue   4. hémisphère   segment   edge   pentagon   hemisphere   Half-n-half Clue   5. hexagone   rhombus   hexagon   polygon   oval   Half-n-half Clue   6. pyramide   parallel lines   pyramid   convex   ellipse   Half-n-half Clue   7. rayon   hexagon   ray   edge   rhombus   Half-n-half Clue