l4ilaoperr2ard l4ilaoperr2ard

30-05-2016
Mathematics

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The diagram shows a semicircle divided into three arcs of equal length, where A is the midpoint of . What is mDEC?

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Kalahira Kalahira

18-04-2017

mDEC will be equal to mECA. This is because AC and ED are parallel lines, cut through by a transversal line (EC). This makes mDEC and mECA interior angles, which are, by definition, equal to one another.

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