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Mathematics 13 Online
OpenStudy (anonymous):

explain why an angle thst is supplementary to an acute angle must be an obtuse angle

OpenStudy (anonymous):

supplementary angles add up to 180 degrees. if one is less than 90, the other angle must be greater than 90 in order to add up to 180 degrees (old answer on open study http://openstudy.com/study#/updates/4e6e93ee0b8beaebb295f8a7 )

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