12 sided regular polygon.
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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
An angle of 30 degrees is an acute angle because it is greater than 0 but less than 90 degrees
A right triangle with a hypotenuse of 12cm and an angle 30 degrees has an opposite angle of: 60 degrees.
An angle with 30 degrees is an acute angle.
If it's a right angle triangle then the the third angle is 60 degrees.