In rectangular parallelepiped ABCDA1B1C1D1, the edge lengths AB = 5, AD = 12, AA1 = 21 are known.
| December 16, 2020 | education
In rectangular parallelepiped ABCDA1B1C1D1, the edge lengths AB = 5, AD = 12, AA1 = 21 are known. Find the tangent of the acute angle between lines CD and A1C1.
Instead of A1C1, we take the line AC parallel to it. tg of an acute angle between lines CD and A1C1 will be equal to the ratio of sides AD and DC (12 and 5)
Answer: 2.4
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