1. pentagono   pyramid   convex   oval   pentagon   Hint Half-n-half Clue   2. prisma   segment   oval   hexagon   prism   Half-n-half Clue   3. quadrilateral   oval   quadrilateral   ray   pentagon   Half-n-half Clue   4. ovale   perpendicular lines   quadrangle   oval   hemisphere   Half-n-half Clue   5. concavo   parallelogram   concave   plane   ellipse   Half-n-half Clue   6. linee perpendicolari   plane   perpendicular lines   quadrilateral   quadrangle   Half-n-half Clue   7. quadrangolo   ellipse   vertex   hemisphere   quadrangle   Half-n-half Clue