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It is a regular hexagon, a 6-sided polygon.

The formula for calculating the identical interior angles of a regular n-sided polygon is 180(n-2)/n

The equivalent formula for each interior angle is 180 - (360/n) where 360/n is the measurement of any exterior angle, supplementary to the paired interior angle.

180-120 = 360/n

60 = 360/n

n = 6

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Sums of interior angles for the first 6 polygons:

triangle = 180

quadrilateral = 360

pentagon = 540

hexagon = 720

heptagon = 900

octagon = 1080

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Q: What regular polygon has interior angles of 120 degrees?
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