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Yes.
All of the angles in a triangle add up to 180, so if one angel was 34, and another angle was 67, than the mystery angle would be 79. I got that because 180-(a+b)=c. 34 is a, and 67 is b.
In order for your to know the weight must know the thickness of the angle bar.
That depends what you want to calculate.
The 45 degrees is an angle. To calculate an area the length and width are needed.