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What is the relationship between line l and m with measures in explanation

What is the relationship between line l and m with measures in explanation-example-1
User Javette
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The intersection between lines l and m would produce angles that are 90 degrees each in each numbered area. Thus the angle in m1 and m3 would each be 90 degrees which add to produce a total of 180 degrees.
User Uffe Kousgaard
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