1. raggio   pyramid   ray   pentagon   hemisphere   Hint Half-n-half Clue   2. piano   plane   convex   segment   vertex   Half-n-half Clue   3. ellisse   parallel lines   oval   ellipse   hexagon   Half-n-half Clue   4. parallelogramma   pentagon   hexagon   vertex   parallelogram   Half-n-half Clue   5. emisfero   hemisphere   pyramid   concave   quadrilateral   Half-n-half Clue   6. konvex   segment   convex   parallel lines   pentagon   Half-n-half Clue   7. bordo   ray   edge   convex   perpendicular lines   Half-n-half Clue