1. convex   Rhombus   Konvex   Viereck   oval   Hint Half-n-half Clue   2. pyramid   Vieleck   Pyramide   Ellipse   Senkrechtlinien   Half-n-half Clue   3. parallel lines   oval   parallele Linien   Hexagon   flach   Half-n-half Clue   4. parallelogram   Konvex   Konkav   Parallelogramm   oval   Half-n-half Clue   5. ellipse   heptágono   Ellipse   Konkav   Pyramide   Half-n-half Clue   6. plane   Viereck   Segment   Strahl   flach   Half-n-half Clue   7. heptagon   Viereck   Hemisphäre   Gipfel   heptágono   Half-n-half Clue