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Did You Work It Out? The Solution to Our Riddle from the E-News Issue of May 2011

How does the center point of the ladder slide?
A ladder is leaned against a wall. Slowly, its bottom end is pulled away until the ladder lies flat on the floor. On which curve does the center point of the ladder move (a, b or c)?

혼자 풀어 보세요. 자, 연필 및 종이를 사용하여 사다리이 이동 경로를 본떠 보세요.

사다리의 중심점의 이동이 곡선 C)와 같은 것이 보이나요?