1. duo [jia;jiao;jue] xing   polygon   hexagon   quadrangle   convex   Hint Half-n-half Clue   2. [bian;bian] yuan   perpendicular lines   hexagon   edge   quadrangle   Half-n-half Clue   3. [leng;leng;ling] jing   prism   concave   rhombus   quadrangle   Half-n-half Clue   4. jin zi [da;ta]   pentagon   hemisphere   pyramid   vertex   Half-n-half Clue   5. si [bian;bian] xing   straight line   perpendicular lines   quadrangle   oval   Half-n-half Clue   6. tuo yuan   ellipse   pyramid   polygon   pentagon   Half-n-half Clue   7. si fang xing   hexagon   segment   oval   quadrilateral   Half-n-half Clue