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Oct 27th, 2015

Thank you for the opportunity to help you with your question!

Always remember that the order of the letters tells us the measure of each part. EC is the same as BC because of where they appear in the name of the triangle (^ABC = ^ DEC). Now, if we figure out BC, we at the same time find EC since they are the same. BC is 12, so EC is also 12.

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Oct 27th, 2015

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