1. heptágono   oval   heptagon   quadrilateral   pyramid   Hint Half-n-half Clue   2. Konkav   straight line   plane   concave   perpendicular lines   Half-n-half Clue   3. Parallelogramm   straight line   parallelogram   segment   hexagon   Half-n-half Clue   4. flach   plane   rhombus   pentagon   polygon   Half-n-half Clue   5. Pentagon   concave   vertex   ellipse   pentagon   Half-n-half Clue   6. Senkrechtlinien   perpendicular lines   vertex   straight line   parallel lines   Half-n-half Clue   7. Segment   prism   quadrangle   straight line   segment   Half-n-half Clue