The right tool for me?

[hagbard1st]

Hi there

I'm searching for a tool to lay down a groundplan of an area where the finding places of a certain plant have to be ploted.
I'm not worring so much about the plants right now. My problem is to build up that groundplan.
This is because the way of proceeding must be as follows:

- The length of all the segments of the polygon are given
- The length of at least two diagonals are given

With the given dimensions it should be possible to puzzle together that polygon representing my area in the field.
The important point is that the length of each segment is fixed and no angle is given.

If anyone knows a program that can help me create these polygons he/she would make my day!

Thanks and all the best!
Sascha