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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?

The diagram shows a semicircle divided into three arcs of equal length, where A is the midpoint of . What is mDEC?
asked 21.1k views
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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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User Dheeraj Sachan
by
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1 Answer

4 votes
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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User User Unknown
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