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Mathematics 12 Online
OpenStudy (anonymous):

which statement proves that line AC is parallel to line EF? A) m∠DEB + m∠DEA =180° B) m∠DEB +m∠BEF =180° C) m∠AEF + m∠EAC =180° D) mAEF + m∠ACF =180° please explain I'm desperate!

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