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If ABCD is a parallelogram, m supplementary)
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If ABCD is a parallelogram, m supplementary)

If ABCD is a parallelogram, m supplementary)-example-1
User Merita
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The third choice, 3x + 4 + x = 90.
Angles A and D should add to 90 degrees.
Just like how angles A and B should add to 90 degrees and angles D and C.
The whole parallelogram should add to 360 degrees.
User Anchandra
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