Given points of latitude and longitude, find boundary points and polygon area

from the name you can read that I have been given points of latitude and longitude. They are stored in a file csv. There are up to 40 thousand lines.

"45.01234","9.12345"
"46.11111","9.12345"
"47.22222","9.98765"
...

My first question is: how can I find the boundary coordinates and after this is done, it will turn over my second question, which I need to calculate from this area of ​​the polygon. Below is a picture of how these points can look, and the boundary points are connected with blue lines.

coordinates

I searched google and on SO and found questions like this , this , this and this .

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