Not sure if this will help, but you may try: http://www.mathopenref.com/constcopyangle.html
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A protractor is usually used to measure an angle.
The instrument you are looking for is a compass
Some of the devices used to measure angle are Transit, Protractor and Compass.
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.
It is indeed impossible to trisect an angle using only a [pair of] compass[es] and a straight edge.It is in fact possible:1) measure the angle2) divide this measure by three3) measure the angle found in part (2) inward from the outer edge of the main angle4) use the straight edge to draw the trisectorsit is!!!!!!!!!!!!!!!!!!