1. linee parallele   perpendicular lines   pyramid   hexagon   parallel lines   Hint Half-n-half Clue   2. pentagono   convex   ray   pentagon   ellipse   Half-n-half Clue   3. linee perpendicolari   perpendicular lines   quadrangle   quadrilateral   prism   Half-n-half Clue   4. ovale   polygon   ellipse   pyramid   oval   Half-n-half Clue   5. parallelogramma   parallelogram   ray   perpendicular lines   polygon   Half-n-half Clue   6. emisfero   parallel lines   ellipse   hemisphere   prism   Half-n-half Clue   7. piano   vertex   hexagon   plane   perpendicular lines   Half-n-half Clue