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Tyrannas · Answer 1 · 2021-04-08T16:29:59+0000

120 degrees
angles 1 and 3 are corresponding, therefore they are congruent. set the equations equal, and solve for x. 20x+60=30x+20, 40=10x, x=4. Now plug in x in the equation for angle 1. 20*4+60=measure of angle 1= 120 degrees

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