1. 面積   sphere   rectangle   triangle   area   Hint Half-n-half Clue   2. 三角形   square   triangle   semicircle   cube   Half-n-half Clue   3. 円、丸　   circumference   curve   circle   radius   Half-n-half Clue   4. 矩形   cylinder   perimeter   curve   rectangle   Half-n-half Clue   5. 曲線,   semicircle   cone   perimeter   curve   Half-n-half Clue   6. 四角形   triangle   side   square   cone   Half-n-half Clue   7. 円周   angle   cone   square   circumference   Half-n-half Clue