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Sphere and octahedron

Author:
Т.С.
Topic:
Sphere
В благодарную память о uStas'е http://tube.geogebra.org/ustas Given a ball of radius 3. Line segments KK_1, MM_1, NN_1 are three mutually perpendicular diameters. Find the angle and distance between lines KM and NK_1.

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