The length of EF is 100 units.
To find EF, we need to understand the concept of a perpendicular bisector.
A perpendicular bisector is a line that passes through the midpoint of another line segment and is perpendicular to it.
In this case, line m is the perpendicular bisector of FH. Since EH is given as 100 units, this means that EF is also 100 units.
The question probable may be:
What is the concept of a perpendicular bisector, and how does it relate to finding the length of EF in the given scenario where line m is the perpendicular bisector of FH, and EH is given as 100 units?