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Supplementary and Complementary Angle Pairs

Find missing angle measures for supplementary or complementary angles.

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Geometry Definitions and Introduction to Proof
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    Algebra and Vertical Angles
    Teacher Contributed
    In the diagram below, \(m\angle ACD = (7x -114)^\circ, \; m\angle ECB = (4x -57)^\circ\). What is the value of \(x\)?
    C
    $$A$$
    $$B$$
    $$D$$
    $$E$$
    qid: 100094
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