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I am (a retired statistician but now) doing some work designing sails and rigs for my boats.
The reason for embarking as developer was that I found that LibreCad could compute area and circumference of a closed polygon, but could not compute its centroid. The location of the centroid of a sail, aka its center of effort, is important in order to match the rig to the boat´s underwater geometry. Took me a little time to fix this so now I can contribute some amended source code.
C++ was actually a new experience for me. Seems to be not friendly for mathematical purposes though.