1. [leng;leng;ling] jing   quadrangle   prism   parallel lines   vertex   Hint Half-n-half Clue   2. duan   polygon   segment   plane   vertex   Half-n-half Clue   3. chui zhi xian   rhombus   parallelogram   perpendicular lines   pyramid   Half-n-half Clue   4. si [bian;bian] xing   oval   convex   quadrangle   heptagon   Half-n-half Clue   5. jin zi [da;ta]   plane   polygon   pyramid   hexagon   Half-n-half Clue   6. wu [bian;bian] xing   parallel lines   quadrilateral   edge   pentagon   Half-n-half Clue   7. duan dian   oval   plane   perpendicular lines   vertex   Half-n-half Clue