# Is a Trapezoid a Parallelogram?

## Quadrilateral ABCD starts out as a trapezoid with AB||CD. Drag point D left and right keeping AB||CD.

Under the classic definition of a trapezoid (also called the exclusive definition), there is one place you could land D that would suddenly make ABCD NOT a trapezoid anymore.
Where is that location? What do you think about the fact that this shape is suddenly no longer a trapezoid?

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