%0 Journal Article %T The Choice of Intermediary When Solving the First Positional Tasks %A Ivanov, G.. %A Dmitrieva, I.M. %K descriptive geometry, the first positional task, the intermediary, the cross-section surface, the disintegration of the line of the intersection. %J Geometry & Graphics %D 2015 %N 3 %P 4 %I INFRA-M Academic Publishing LLC.