1. quadrilateral   losanga   quadrilateral   pentagono   concavo   Hint Half-n-half Clue   2. ellipse   ellisse   concavo   piramide   parallelogramma   Half-n-half Clue   3. segment   segmento   quadrilateral   poligono   linee parallele   Half-n-half Clue   4. prism   quadrangolo   prisma   bordo   segmento   Half-n-half Clue   5. parallelogram   piano   quadrilateral   prisma   parallelogramma   Half-n-half Clue   6. straight line   quadrilateral   linee perpendicolari   ellisse   linea retta   Half-n-half Clue   7. concave   raggio   concavo   prisma   ovale   Half-n-half Clue