4bunmyeonui
quadrantal
quadrant ; secteur de quatre parties
4분면의 좌표계를 사용하여 문제를 해결했습니다.
sa-bun-myeon-ui jwahyo-gye-reul sayonghayeo munje-reul haegyeolhaessseubnida.
I solved the problem using a quadrantal coordinate system.
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