You need some sort of other angle like if there is a line that is 180 degree and and angle that is 90 you no the other is 90 so you need other angles to find out the answer or a logical guess
I use a corner of a sheet of paper. You know that is 90 degrees. You can at least tell if the angle is acute or obtuse.
Or fold a corner of a sheet of paper in half, and you will have a 45 degree angle to use as a comparison.
Good luck!
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