Question

HD, JD, and KD are the perpendicular bisectors of triangle EFG. Find each length

Answer 1

Since all three are perpendicular bisectors, the segment it bisects is equal on both sides.

Let's do segment EF.
HD bisects EF, therefore EF is split in half. All you have to do is add 16 to itself. This will be the same for the remaining two sides of that triangle. I'm hoping that was the only lengths you needed.