Question,nsider parallelogram $J K L M$ below.
Note that $J K L M$ has vertices $J(-6,-2), K(-1,6), L(7,1)$, and Answer the following to determine if the parallelogram is a rectangle, (a) Find the length of $\overline{J K}$ and the length of a side adjacent to $\overline{J K}$. Give exact answers (not decimal approximations).
Length of $\overline{J K}$ : $\square$
Length of side adjacent to $\overline{J K}$ : $\square$