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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.
It can appear to have different shapes because of the viewers point of view. Also Parallax can have an affect on it! Google it for further research look up Galaxy Parallax. Glad I Could help! Another opinion: All observers see the same shape of any galaxy, and no galaxy exhibits parallax, as long as we're talking about observations taken anywhere in our solar system.
A right angle is a angle with 90o
what angle does a hemisphere have what angle does a hemisphere have what angle does a hemisphere have
So basically , you have an right angle and another angle . You draw an right angle over the angle your looking at and if its smaller than the right angle then its an acute angle . If its bigger than the right angle then its a obtuse angle . GoodLuck!(;