1. parallele Linien   parallel lines   edge   segment   perpendicular lines   Hint Half-n-half Clue   2. oval   oval   concave   parallel lines   quadrangle   Half-n-half Clue   3. heptágono   edge   ray   segment   heptagon   Half-n-half Clue   4. Parallelogramm   vertex   quadrangle   polygon   parallelogram   Half-n-half Clue   5. Gipfel   vertex   polygon   perpendicular lines   plane   Half-n-half Clue   6. Konkav   straight line   concave   perpendicular lines   plane   Half-n-half Clue   7. Pentagon   heptagon   pentagon   plane   quadrilateral   Half-n-half Clue