Most times when you create a section you will want to calculate its properties relative to a set of axes at the centroid of its area. The Align To Centroid command moves all of the selected shapes so that their common centre of area is aligned with the origin of the axes. After using Align To Centroid the coordinates of the centroid of the selected shapes will always be x=0,y=0.

To align the centroid of a shape or shapes with the axis origin

§    Select the shape or shapes to be aligned

§    Choose Align To Centroid from the Geometry menu

§    Choose from the sub-menu whether to align one or both axes

The shapes will be moved as a group to centre their area about the axis origin