TOTAL internal angle = (2n-4)x90 = 56x90 = 5040 degrees
Each node has an internal angle of 5040/30 = 168 degrees
TOTAL external angle = (2n+4)x90 = 64x90 = 5760 degrees
Each node has an external angle of 5760/30 = 192 degrees
(Check 168+192 = 360 degrees)
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