Дано: ABCDA1B1C1D1 – куб, АВ = a, K ∈ A1D1, A1K = 0,25a, L ∈ B1C1, B1L = 1/3 a, M ∈ BC, BM = 0,5a KLM – плоскость.
Найти: Периметр четырехугольника KLMN
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