Distance for degree on the Earth [closed]

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At one of questions I seen the below answer ::

Based on average distance for degress in the Earth.

1° = 111km;

can anybody say how this transformation is done ?

is it will be same for each place on the earth ?

Answer 1

The equatorial circumference of the earth is ~40000km.

There are 360 degrees.

Divide one by the other.

So this only applies at the circumference, and decreases the closer you get to the poles.

So it's not an average, but a maximum.