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HW questions MC-2a number 6.28

Re: HW questions MC-2a number 6.28

Here's a head start on that problem: Let $AC$ be the diagonal that has length $10$, and $BC$ be the small base of the trapezoid. Let $E$ be a point such that $BCAE$ is a parallelogram. What can you say about the length of the sides of this parallelogram?