The opposite angles of a parallelogram are equal so math up the opposite angles.
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Except for rectangles, no parallelogram has right angles.
In a parallelogram consecutive angles are always supplementary. This means they equal 180.
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Then it's consecutive angles are supplementary.
Generally false. In a parallelogram, the opposite angles are equal. They could be complementary in a highly skewed parallelogram in which one angle is 45 degrees.