It is the midpoint of the straight line joining E and A.
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It is the sum of the y-coordinates of the vertices divided by the number of vertices.
The abscissa is 8.
Count the lengths of each side and sum them up (add them all together.)
The fly's distance, assuming the coordinates are measured from the corner nearest to the fly, is the hypotenuse of a right triangle with base of x (1) and height of y (2). Thus, the formula given in the Pythagorean Theorem (the root of a sum of squares) will yield the result; precisely the square root of 5, or 2.2360679774997896964091736687313
The angles of a triangle sum to pi radians, or the angles at a point sum to 2*pi radians.