1. 半円   circle   area   semicircle   triangle   Hint Half-n-half Clue   2. 円、丸　   circle   perimeter   square   curve   Half-n-half Clue   3. 矩形   rectangle   circle   sphere   semicircle   Half-n-half Clue   4. 三乗、立方体、   semicircle   side   cube   curve   Half-n-half Clue   5. 側   cube   side   square   cone   Half-n-half Clue   6. 円周   semicircle   radius   circumference   point   Half-n-half Clue   7. 四角形   square   perimeter   cube   triangle   Half-n-half Clue