Which of the following conditions in a quadrilateral proves it is a parallelogram?

a.) opposite sides are parallel
b.) opposite sides are equal in length
c.) opposite angles are equal (angles "a" are the same, and angles "b" are the same)
d.) angles "a" and "b" add up to 180°, so they are supplementary angles.

its the second choice.

step-by-step explanation:

the elements in the range will be 7 less than the elements in the domain.

step-by-step explanation:

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