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삼각형의 내심
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삼각형의 외심과 내심
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일차함수 그래프 성질 탐구
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외심과 내심의 작도
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원주각 수업
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일차부등식
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부등식의 해와 그 성질
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원주각과 현의 성질
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탈레스의 원
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원주각의성질
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원주각2
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