This Proforma calculates the section properties, using co-ordinate geometry, of an irregular shaped cross section containing voids.

Section properties, Area, Ixx, Iyy and xy co-ordinates of the centroid are determined for a voided irregular shaped section. Outline of the section and void is input using x-y co-ordinates. Circular voids can be input using the diameter and xy co-ordinates of their centre.

**INSTRUCTIONS**

- Enter data in the yellow cells only.
- Enter XY co-ordinates in the table on the left for the outside perimeter of the section.
- Points must be entered in an anti-clockwise direction.
- The start point must have the same X Y co-ordinate as the last point.
- Enter XY co-ordinates in the centre table for the inside perimeter of the void in a similar manner as described above.
- If circular voids are required they may be input in the table on the right. The diameter of the void is required together with the XY co-ordinates of the centre of the circle. Up to 20 individual voids may be input.
- Unused cells shall be emptied using the DELETE key or may contain 0. If a print-out is required then the page should be set to landscape.

* Voided Irregular Sections download link provides freeware version of the software.

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