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정의 7
Author:
WoonGu, Hwang
정의 7
‘평면(plane surface)’
은 직선들이 쭉 고르게 놓여있는 면이다.
부연설명
평면은 면에서 임의의 두 점을 연결한 직선이 면 위에 다시 놓여 있을 때를 말한다.
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