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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

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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