1. polygone   concave   prism   polygon   quadrilateral   Hint Half-n-half Clue   2. convexe   prism   straight line   convex   perpendicular lines   Half-n-half Clue   3. parallélogramme   plane   concave   polygon   parallelogram   Half-n-half Clue   4. prisme   prism   quadrilateral   quadrangle   concave   Half-n-half Clue   5. pyramide   parallelogram   parallel lines   oval   pyramid   Half-n-half Clue   6. rebord   edge   pentagon   vertex   segment   Half-n-half Clue   7. sommet   ray   vertex   convex   concave   Half-n-half Clue