1. 点   angle   point   semicircle   line   Hint Half-n-half Clue   2. 容量   volume   rectangle   point   radius   Half-n-half Clue   3. 边   semicircle   cube   side   circumference   Half-n-half Clue   4. 半径   side   diameter   perimeter   radius   Half-n-half Clue   5. 长方形   cylinder   rectangle   area   diameter   Half-n-half Clue   6. 球形   cylinder   sphere   point   square   Half-n-half Clue   7. 圆筒   diameter   cylinder   triangle   cube   Half-n-half Clue