1. Konvex   quadrilateral   perpendicular lines   rhombus   convex   Hint Half-n-half Clue   2. parallele Linien   oval   parallel lines   quadrangle   ray   Half-n-half Clue   3. Ellipse   segment   ray   parallel lines   ellipse   Half-n-half Clue   4. heptágono   heptagon   parallel lines   straight line   plane   Half-n-half Clue   5. Pentagon   hexagon   ray   hemisphere   pentagon   Half-n-half Clue   6. Parallelogramm   vertex   plane   edge   parallelogram   Half-n-half Clue   7. Hexagon   pyramid   polygon   hexagon   concave   Half-n-half Clue