To determine the length of HE, we can consider the relationship between the known segments. It can be helpful to visualize or specify the geometric configuration in which FC and FH are given.
However, based on standard geometric relationships, if you assume the following:
- FC is a total vertical or horizontal length
- FH is a shorter segment
If it's reasonable to infer that HE is the remaining part of FC minus FH, you can subtract FH from FC:
HE = FC - FH = 20 m - 12 m = 8 m
Therefore, the length of HE is 8 m.