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Mathematics 21 Online
OpenStudy (anonymous):

The diagram shows a semicircle divided into three arcs of equal length, where A is the midpoint of . What is mDEC? A-90° B-60° C-30° D-15° http://contentlaunch.ple.platoweb.com/testimagedb/b6/b62d886a62c77d2d3b8b3e4b93512977 @abhisar ??

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