1. heptágono   quadrangle   heptagon   convex   perpendicular lines   Hint Half-n-half Clue   2. Gipfel   parallelogram   perpendicular lines   prism   vertex   Half-n-half Clue   3. Senkrechtlinien   perpendicular lines   straight line   polygon   ray   Half-n-half Clue   4. Ellipse   hemisphere   convex   hexagon   ellipse   Half-n-half Clue   5. Viereck   parallel lines   rhombus   quadrilateral   perpendicular lines   Half-n-half Clue   6. Vieleck   plane   pentagon   rhombus   polygon   Half-n-half Clue   7. Parallelogramm   parallelogram   hexagon   edge   straight line   Half-n-half Clue