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내 이어폰은 어디에 있을까? (삼각형의 외심, 원의 현의 이등분선)
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일차함수의 평행이동
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수직선 위 일차 부등식
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원기둥의 일부 (조각 케이크 모양)
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원기둥과 각기둥
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구의 단면 관찰
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부채꼴 기둥 만들기
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정다각형의 대각선 (겹치지 않음)
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원의 넓이
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부채꼴의 성질
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V. 원의 성질 - 04.원주각의 활용 (2) : 현과 접선이 이루는 각
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원과 현 - 창덕궁 관람정에 담긴 수학
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