1. quadrilateral   ellisse   concavo   quadrilateral   piramide   Hint Half-n-half Clue   2. ray   quadrilateral   pentagono   konvex   raggio   Half-n-half Clue   3. ellipse   parallelogramma   linee parallele   konvex   ellisse   Half-n-half Clue   4. parallel lines   pentagono   bordo   piano   linee parallele   Half-n-half Clue   5. segment   segmento   prisma   losanga   ovale   Half-n-half Clue   6. hexagon   piano   linee parallele   esagono   ovale   Half-n-half Clue   7. rhombus   konvex   quadrangolo   linee perpendicolari   losanga   Half-n-half Clue