1. 矩形   square   rectangle   point   cylinder   Hint Half-n-half Clue   2. 円周   circumference   cylinder   area   cone   Half-n-half Clue   3. 角   cube   semicircle   square   angle   Half-n-half Clue   4. 直径　   diameter   rectangle   cone   cube   Half-n-half Clue   5. 周囲長   diameter   triangle   cube   perimeter   Half-n-half Clue   6. 面積   area   square   side   radius   Half-n-half Clue   7. 線　   line   diameter   curve   area   Half-n-half Clue