you first measure it on your protractor correctly then you use it:)
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Yes by bisecting an angle of 140 degrees with a compass
use trisection method
There are 60 minutes in 1 degree.
its East...
Draw a point, and a long straight line through it. Put the centre of the compass over the point, with north on the compass (or zero degrees) on the line. Then draw a second line out from the point at 80 degrees on the compass. You'll then have a 80 degree angle between the lines. It's usually a trick that teachers decide to do on their pupils. A compass is what you use to find north and a pair of compasses is used to draw circles.