1. ling xing   prism   perpendicular lines   quadrangle   rhombus   Hint Half-n-half Clue   2. si [bian;bian] xing   oval   rhombus   quadrangle   hemisphere   Half-n-half Clue   3. ping [hang;hang;heng;xing] [de;di;di] xian   ray   straight line   parallel lines   quadrangle   Half-n-half Clue   4. luan xing   oval   edge   perpendicular lines   parallelogram   Half-n-half Clue   5. ping [hang;hang;heng;xing] si [bian;bian] xing   quadrilateral   heptagon   parallelogram   segment   Half-n-half Clue   6. duan   rhombus   ray   plane   segment   Half-n-half Clue   7. chui zhi xian   prism   convex   parallelogram   perpendicular lines   Half-n-half Clue