Question: What is the average distance between two points on the surface of a sphere with a radius r?

I came up with this question while thinking "What is the average distance of any point on earth from me" and cannot find out HOW I would go about figuring this out. Any guidance is greatly appreciated

EDIT: Revise the question above to "What is the average distance between two points on the surface of a sphere with a radius R by traveling directly in a straight line from point A to B" I apologize for the original wording.

I came up with this question while thinking "What is the average distance of any point on earth from me" and cannot find out HOW I would go about figuring this out. Any guidance is greatly appreciated

EDIT: Revise the question above to "What is the average distance between two points on the surface of a sphere with a radius R by traveling directly in a straight line from point A to B" I apologize for the original wording.

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