1. poligono   polygon   concave   hemisphere   ray   Hint Half-n-half Clue   2. emisfero   hemisphere   straight line   pyramid   perpendicular lines   Half-n-half Clue   3. quadrilateral   prism   quadrangle   hemisphere   quadrilateral   Half-n-half Clue   4. concavo   perpendicular lines   quadrangle   concave   convex   Half-n-half Clue   5. linee perpendicolari   polygon   ellipse   segment   perpendicular lines   Half-n-half Clue   6. segmento   vertex   straight line   pentagon   segment   Half-n-half Clue   7. konvex   vertex   convex   quadrilateral   polygon   Half-n-half Clue