help please?

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Screen%20Shot%202014-08-06%20at%201.38.4
Oct 16th, 2017

180(n-2)/n = 140.
180n-360 = 140n
-360 = -40n
n = 9  NONAGON

UV=1/2(XY+WZ)
XY=2UV-WZ
XY=2*29-40
XY=18

Aug 6th, 2014

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