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  • Let two planes <math>\Pi</math> and <math>\Pi'</math> and a point <math>O</math> not lying in them be defined in space. To each point ...lowing problem. Let us construct a plane containing a point <math>O</math> and parallel to the plane <math>\Pi'.</math> Let us denote the line along which
    39 KB (6,959 words) - 14:26, 3 December 2024