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OpenStudy (anonymous):
If quadrilateral ABCD is a parallelogram, then which of the following statements must be true? A D mA + mD = 90° mA + mC = 180° mB + mC = 180
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OpenStudy (anonymous):
OpenStudy (amistre64):
A + D = 180 A + C = 2A or 2C; not 180 unless its a rectangle/square B+C = 180 its that one
OpenStudy (anonymous):
your right!
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