1. Segment   vertex   convex   segment   plane   Hint Half-n-half Clue   2. Parallelogramm   plane   parallelogram   rhombus   perpendicular lines   Half-n-half Clue   3. Viereck   quadrilateral   concave   oval   plane   Half-n-half Clue   4. Pyramide   segment   ray   pyramid   rhombus   Half-n-half Clue   5. Konkav   pyramid   quadrilateral   concave   perpendicular lines   Half-n-half Clue   6. Hemisphäre   hemisphere   oval   pyramid   prism   Half-n-half Clue   7. heptágono   pyramid   pentagon   straight line   heptagon   Half-n-half Clue