1. 边   side   curve   semicircle   radius   Hint Half-n-half Clue   2. 容量   perimeter   volume   circumference   triangle   Half-n-half Clue   3. 半径   curve   radius   triangle   cone   Half-n-half Clue   4. 圈子   curve   cylinder   circle   rectangle   Half-n-half Clue   5. 半圆   diameter   semicircle   square   curve   Half-n-half Clue   6. 长方形   diameter   circle   rectangle   point   Half-n-half Clue   7. 圆周   sphere   perimeter   circumference   volume   Half-n-half Clue