A set of points on the line lying between fixed points and including these points., segment, perimeter, perpendicular, substitution, A sum of all lengths of all sides of polygon., segment, perimeter of polygon, perpendicular, substitution, Replacement of one expression by another equal expression., segment, perimeter, perpendicular, substitution, A line that intersects the given line at a right angle., segment, perimeter, perpendicular, substitution, A polyhedron whose basis is a polygon and the other faces of the polyhedron are triangles with a common vertex., segment, perimeter, pyramid, substitution, A surface of the 1st order which fully contains every line connecting any of its points., plane, perimeter, pyramid, substitution

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