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OpenStudy (anonymous):
The trapezoid ABDE is part of an isosceles triangle ACE. find the measure of the vertex angle of triangle ACE. A. 130 B. 60 C. 65 D. 50
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OpenStudy (anonymous):
OpenStudy (anonymous):
mACE = 180 -2mAEC = 180 -2(180 - mBDE) = 180 - 2(180 -- 115) = 50 degrees
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