1. pyramide   pyramid   concave   polygon   quadrangle   Hint Half-n-half Clue   2. lignes parallèles   oval   concave   parallel lines   perpendicular lines   Half-n-half Clue   3. parallélogramme   parallelogram   quadrilateral   hexagon   ray   Half-n-half Clue   4. lignes perpendiculaires   polygon   segment   perpendicular lines   prism   Half-n-half Clue   5. quadrilatère   pyramid   polygon   quadrangle   plane   Half-n-half Clue   6. losange   prism   oval   rhombus   plane   Half-n-half Clue   7. sommet   ray   oval   vertex   prism   Half-n-half Clue