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Mathematics 19 Online
OpenStudy (anonymous):

Help?!?! ABCD is a quadrilateral. If AB = DC,

OpenStudy (mathstudent55):

AB||CD

OpenStudy (mathstudent55):

If one pair of sides of a quadrilateral is both parallel and congruent, the quadrilateral is a parallelogram.

OpenStudy (anonymous):

thank you for explaining this to me!

OpenStudy (mathstudent55):

There are more. AD = BC also would guarantee ABCD is a parallelogram. If both pairs of opposite sides of a quadrilateral are congruent, it is a parallelogram.

OpenStudy (anonymous):

so I'm stuck? or was that correct?

OpenStudy (mathstudent55):

I gave you two ways. All you need is one of them.

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