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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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Q: What is the measure of 30 sided single angle?
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