With a protractor or construct an equilateral triangle which has 3 equal interior angles of 60 degrees
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An equilateral triangle has two 60 degree angles which must make its third angle also 60 degrees
There are 60 minutes of angle in one degree of angle.
a 60-degree angle
A 60 degree angle is an acute angle because it is greater than 0 but less than 90 degrees.
It is easy to draw an equilateral triangle without a protractor. That gives a 60 degree angle. It is then simply a matter of bisecting the 60 degree angle, using an unmarked rule and compass, to get a 30 degree angle.