It is a simple way to reduce the number of intermediate points of an arc/line in order to speed up the calculation

Buffering algorithm, in input you can upload point, lines and polygons. The files should be in kml format.
The result file is in kml format.

You can calculate the area of the buffer

A vector-based system, topological map overlay operations allow the polygon features of one layer to be overlaid on the polygon, point, or line features of another layer. Depending on the objectives of the Overlay operation, different output features can result.