1. 球形   circle   sphere   radius   semicircle   Hint Half-n-half Clue   2. 点   point   semicircle   square   area   Half-n-half Clue   3. 三角   cone   triangle   cube   volume   Half-n-half Clue   4. 半圆   line   cone   angle   semicircle   Half-n-half Clue   5. 直径   line   semicircle   diameter   curve   Half-n-half Clue   6. 容量   volume   perimeter   sphere   semicircle   Half-n-half Clue   7. 边   square   side   sphere   cube   Half-n-half Clue