No. 85. Draw a parallelepiped ABCDA1B1C1D1 and construct its section by plane BKL, where K
#85. Draw parallelepiped ABCDA1B1C1D1 and construct its section by plane BKL, where K is the midpoint of edge AA1 and L is the midpoint of edge CC1. Prove that the section constructed is a parallelogram.
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