1. piano   straight line   hexagon   plane   edge   Hint Half-n-half Clue   2. quadrangolo   oval   quadrangle   straight line   hemisphere   Half-n-half Clue   3. poligono   perpendicular lines   polygon   hexagon   pyramid   Half-n-half Clue   4. vertice   hexagon   straight line   vertex   quadrangle   Half-n-half Clue   5. konvex   ellipse   perpendicular lines   convex   plane   Half-n-half Clue   6. concavo   concave   pentagon   parallel lines   polygon   Half-n-half Clue   7. bordo   rhombus   segment   plane   edge   Half-n-half Clue