2) In a n-gon there are exactly n exterior angles. Yes all n exterior angle are considered and their sum is Always equal to 360 degrees.

4) here the sum of internal angles is

(14-2)*180= 12*180 = 2160 degrees

6) here the sum of internal angles is:

(20-2)*180= 3240 degrees

8) here I can write:

(N-2) *180 = 720, so N-2 = 4 and N = 6, so your polygon is an hexagon namely it has 6 sides

10) here we can write:

(N-2) * 180 = 2340, so N-2 = 13 and N=15, so your polygon has 15 sides

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