The 2 lines are parallel, so the 2 sides(e.g. 1 and 2/ 3 and 49) add up = 180 and In this case the 2 sides are equal as u can see from the original diagram so the angle of 2 is 180-49=131.
Find the length and width of a rectangle with maximum area that has a perimeter of 9P units.
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I don't really remember this very well, because it confusing me