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Mathematics 6 Online
OpenStudy (anonymous):

In the figure below, AD || BC and m∠A = 75. What is the measure of ∠B? http://secure.starssuite.com/files/Geo2010/Geom_05S_Fig11.jpg

OpenStudy (anonymous):

m∠A + m∠B = 180. So just subtract m∠A from 180. http://www.mathsisfun.com/geometry/parallelogram.html

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