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Lines l and k are parallel to each other. $m\angle A = 120^\circ$ , and $m\angle C = 80^\circ$ . What is the number of degrees in $m\angle B$ ?

Lightning Sep 23, 2018

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These angles need to sum to 360 degrees.

120 + 80 + B = 360

B = 160 degrees

Rom Sep 23, 2018

edited by Rom Sep 23, 2018

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