Draw a line of any length. Set the protractor at one end of this line and draw an angle of 60 degrees - measuring angles from the other end of the line. Move the protractor to the other end of the original line and repeat.
If necessary extend the lines of the angle until they meet. The three lines will form a regular (equilateral) triangle.
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Yes simply with a protractor and a measuring device.
You could measure it using a protractor, derive it from basic geometric properties (for example angles of a regular polygon), or calculate it using trigonometry.
A protractor is used for measuring angles and the 3 angles in a triangle add up to 180 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.
by using a protractor