Geographical coordinates allow locations or devices with the geographical locations to be tracked and located. In essence, if a phone has geographical positioning built inside the phone can be tracked by satellite and located. An example of this is when people call 911 and they aren't sure where they are. Operators are still able to locate where they are and send help.
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Take the arithmetic average of the y-coordinates of the end points.
You don't!
cause they are important
Use the coordinates of the vertices.
The lines of latitude provide vertical (north-south) coordinates on a map or globe. Lines of longitude provide horizontal (east-west) coordinates. The defined geographical point is where the latitude line intersects the longitude line.