1. segment   pentagon   segment   perpendicular lines   hexagon   Hint Half-n-half Clue   2. Heptagon   heptagon   pyramid   straight line   convex   Half-n-half Clue   3. ligne droite   segment   plane   parallelogram   straight line   Half-n-half Clue   4. ellipse   straight line   ellipse   concave   pentagon   Half-n-half Clue   5. polygone   hexagon   perpendicular lines   pyramid   polygon   Half-n-half Clue   6. quadrilatère   hexagon   rhombus   perpendicular lines   quadrangle   Half-n-half Clue   7. concave   parallelogram   concave   hexagon   rhombus   Half-n-half Clue