1. pentagono   rhombus   pentagon   straight line   concave   Hint Half-n-half Clue   2. emisfero   quadrangle   segment   hexagon   hemisphere   Half-n-half Clue   3. linee perpendicolari   hemisphere   perpendicular lines   pentagon   straight line   Half-n-half Clue   4. segmento   hexagon   quadrilateral   segment   edge   Half-n-half Clue   5. parallelogramma   ray   pentagon   parallelogram   convex   Half-n-half Clue   6. ovale   pyramid   oval   parallel lines   hemisphere   Half-n-half Clue   7. piano   hexagon   vertex   polygon   plane   Half-n-half Clue