Sum of all interior and “exterior angles” = 360n where n is the number of sides.
sum of exterior angles is 360.
So, the sum of interior angles = 360(n-1)·(1–1/(n-1))/2
120°
the sum of the interior angles of a polygon = 180°( n - 2)
where n is the number of sides
here n = 6 ⇒ sum = 180° × 4 = 720°
thus each interior angle = = 120°
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= 120°