Question: Show that the average straight-line distance to a fixed point on the surface of a sphere of radius a (averaged over the whole surface of

Show that the average straight-line distance to a fixed point on

Show that the average straight-line distance to a fixed point on the surface of a sphere of radius a (averaged over the whole surface of the sphere) is 4. [Suggestion: Take the sphere centered at the origin, and choose the "north pole" as the fixed point.]

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Do not take criticism personally, even if it is meant to be personal.

2. To understand that as a general rule it takes about 3 minutes before the other part(s) have made up a 90% impression of you.

3. To understand that the first impression means a lot, and it takes a lot of energy to change this first impression.