Sum_of_angles = (number_of_sides - 2) x 180o
⇒ sum = (30 - 2) x 180o
= 5040o
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12 sided regular polygon.
cut the angle of a decagon in half the cut angle for equal sides is 30 degrees on each end take 180 degrees divide bt # of sides and this will give you the cut angle for any euqal sided shape
A 30 sided shape is called a Triacontagon.
Providing it's a regular 12 sided shape it's 360/12 = 30 degrees
A triacontagon is a thirty-sided polygon.