With a straight edge and a protractor
By using a compass and a protractor and the reflex angle will be 10 degrees less of a full turn which is 360 degrees
A protractor is normally used to construct angles.
Using a protractor will help.
You cannot, you must use a protractor.
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.
With a straight edge and a protractor
In conjunction with a straight edge and a protractor
it
By using a compass and a protractor and the reflex angle will be 10 degrees less of a full turn which is 360 degrees
Use a protractor to measure the angle. Divide that number by 3 and that is the required angle. In general, an angle cannot be trisected using a compass and straight edge.
You can never really be certain about the measure of an angle without using a protractor, or some similar tool. Usually, you can try to "eyeball" it, though. Just remember that a right angle is the same as an angle in a square. It is also a quarter of a whole revolution.
by using a protractor
One way is to use a protractor. There are others
By using a protractor or using trigonometry
By using a protractor we can measure an angle
A protractor is normally used to construct angles.