3) ABCDA1B1C1D1 is a cube. K and F – midpoints of B1C1 and B1B respectively M and P – midpoints of A1D1 and AB respectively.

Lines Mutual positions
A1D1 and BC

BC and KF

KF and MP

BC1 and KF

daryaromanchuk daryaromanchuk    2   26.10.2020 06:28    1

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