That pair of numbers doesn't describe a geographic point. You need one number that's
north or south (the 'latitude' of the point), and one number east or west (the 'longitude'
of the point).
No point on earth can have both a north and a south coordinate, except a point on
the equator, where its latitude is zero.
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There are an infinite number of sets with mean 80. Here are some: {80, 80, 80}, {80, 80, 80, 80, 80, 80} {79, 80, 81}, {79, 79, 80, 81, 81}, {79, 79, 80, 82} (1, 80, 159}, {-40, 200} To produce a set of n numbers with mean 80, start with any set of n-1 numbers. Suppose their sum is S. Then add the number 80*n-S to the set. You will now have n numbers whose sum is S+80*n-S = 80*n So the mean of this set is 80.
40 ! 40 (forty) 2's go into 80 !
180 degrees
That's a difference of 120 degrees.
The sum of the internal angles of a polygon of n sides is (n-2)*180 degrees.