1. gerade Gerade   edge   plane   polygon   straight line   Hint Half-n-half Clue   2. Vieleck   straight line   ray   polygon   quadrangle   Half-n-half Clue   3. Konkav   heptagon   hemisphere   concave   straight line   Half-n-half Clue   4. Parallelogramm   parallelogram   quadrangle   straight line   heptagon   Half-n-half Clue   5. Senkrechtlinien   perpendicular lines   parallel lines   parallelogram   heptagon   Half-n-half Clue   6. Prisma   prism   pentagon   ray   convex   Half-n-half Clue   7. Gipfel   vertex   polygon   oval   quadrilateral   Half-n-half Clue