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9번 인데요

문제상황이 지금

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이거니까 r@ = s 를 써서

r = 4.90m , s = 0.690m 니까 @ = 1.41 rad 인거까진 알겠는데요

그 다음에

@ = 0.690m/4.90m = t(돌의 두께)/0.410m

라고 해서 t를 구하는데

왜 이렇게 되는지 이해를 못하겠어요..


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제가 그림을 못그리는데 이거맞슴니까

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