Accuracy of readings of e.g. meters and certain optical instruments. Parallax is also used in astronomy for calculating distances to(astronmically)far-away objects.
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.2 arc sec
yes you can still determine the angle measure!
The largest angle in a triangle is opposite to its longest side
The supplementary angle of 53 degrees is 127 degrees
YOU can use a right angle by making it small to make it acute or you can make it big so it is obtuse