1. Gipfel   polygon   vertex   ellipse   convex   Hint Half-n-half Clue   2. Strahl   ray   concave   polygon   straight line   Half-n-half Clue   3. Segment   concave   edge   quadrilateral   segment   Half-n-half Clue   4. oval   quadrilateral   ray   oval   vertex   Half-n-half Clue   5. parallele Linien   straight line   parallel lines   heptagon   plane   Half-n-half Clue   6. Kante   pyramid   polygon   parallel lines   edge   Half-n-half Clue   7. Hemisphäre   hexagon   straight line   hemisphere   heptagon   Half-n-half Clue