1. vertice   straight line   pentagon   vertex   edge   Hint Half-n-half Clue   2. pentagono   hemisphere   pentagon   straight line   polygon   Half-n-half Clue   3. raggio   convex   pyramid   concave   ray   Half-n-half Clue   4. segmento   perpendicular lines   parallelogram   segment   concave   Half-n-half Clue   5. quadrangolo   straight line   pentagon   quadrangle   ray   Half-n-half Clue   6. prisma   prism   straight line   vertex   ray   Half-n-half Clue   7. linee perpendicolari   concave   perpendicular lines   ray   convex   Half-n-half Clue