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OpenStudy (anonymous):
If mB = mD = 39°, find mC so that quadrilateral ABCD is a parallelogram. The diagram is not to scale. 39° 282° 141° 78°
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OpenStudy (anonymous):
OpenStudy (anonymous):
141
OpenStudy (anonymous):
cause 360-39-39=282 282/2=141 for the other two angle missing
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