1. convex   chui zhi xian   qi [bian;bian] xing   tu mian   luan xing   Hint Half-n-half Clue   2. rhombus   ling xing   duan   ban qiu   zhi xian   Half-n-half Clue   3. quadrangle   zhi xian   si [bian;bian] xing   fei ji   duan   Half-n-half Clue   4. quadrilateral   si fang xing   tuo yuan   fei ji   duan   Half-n-half Clue   5. edge   ping [hang;hang;heng;xing] si [bian;bian] xing   si [bian;bian] xing   [bian;bian] yuan   jin zi [da;ta]   Half-n-half Clue   6. hemisphere   ban qiu   ping [hang;hang;heng;xing] si [bian;bian] xing   [leng;leng;ling] jing   si fang xing   Half-n-half Clue   7. straight line   zhi xian   ban qiu   fei ji   qi [bian;bian] xing   Half-n-half Clue