Why do longitude lines converge while latitude lines do not?

The reason as to why longitude lines converge while latitude lines do not is;

Explanation:

The longitudes usually divert at the poles, which are the actual distance between two different meridians which is parallel. While moving closer to the poles the range that corresponds to one of latitude degree becomes more excellent than that corresponding to the longitude

Therefore it is not easy to calculate the lengths of the latitudes using through the use of graticule because the lines are concentric and they become small as you move closer to the poles. They form to construct a single point where the meridian starts.

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