1. prisma   polygon   prism   perpendicular lines   convex   Hint Half-n-half Clue   2. losanga   parallel lines   vertex   hexagon   rhombus   Half-n-half Clue   3. konvex   parallel lines   polygon   hexagon   convex   Half-n-half Clue   4. ellisse   edge   pentagon   ellipse   concave   Half-n-half Clue   5. ovale   vertex   plane   oval   perpendicular lines   Half-n-half Clue   6. piano   pyramid   plane   straight line   quadrangle   Half-n-half Clue   7. concavo   quadrangle   rhombus   plane   concave   Half-n-half Clue