1. pyramid   ellisse   piramide   concavo   konvex   Hint Half-n-half Clue   2. oval   raggio   pentagono   esagono   ovale   Half-n-half Clue   3. straight line   raggio   linee perpendicolari   parallelogramma   linea retta   Half-n-half Clue   4. quadrilateral   ellisse   concavo   quadrilateral   konvex   Half-n-half Clue   5. perpendicular lines   ellisse   linee perpendicolari   piramide   parallelogramma   Half-n-half Clue   6. segment   esagono   piramide   pentagono   segmento   Half-n-half Clue   7. rhombus   raggio   losanga   ellisse   bordo   Half-n-half Clue