1. Konkav   hemisphere   pyramid   concave   vertex   Hint Half-n-half Clue   2. Ellipse   plane   ray   convex   ellipse   Half-n-half Clue   3. Konvex   concave   heptagon   oval   convex   Half-n-half Clue   4. Prisma   ray   prism   quadrilateral   edge   Half-n-half Clue   5. Gipfel   vertex   polygon   ellipse   heptagon   Half-n-half Clue   6. parallele Linien   edge   heptagon   parallel lines   hemisphere   Half-n-half Clue   7. Kante   edge   plane   polygon   ellipse   Half-n-half Clue