Basically its just where you position the views of the main object, in first angle projection, if you view the object from the left, the view is drawn to the right of the object, in third angle projection, its drawn on the viewing side.
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You cannot because there is not enough information.
It is an isosceles triangle and the 3rd angle is 72 degrees.
The inter-quartile range.
The angle is 45 degrees look on google 3rd site down! The angle is 45 degrees look on google 3rd site down!
It is a right angle triangle because the 3rd angle has to be 90 degrees