Based on the segment addition postulate, the length of FH is: 20.
Based on the segment addition theorem, if G is on line segment FH, therefore, FG + GH = FH.
Given:
FG + GH = FH (segment addition theorem)
3 + 17 = FH
20 = FH
FH = 20
Therefore, based on the segment addition postulate, the length of FH is: 20.
Learn more about the segment addition postulate on:
https://brainly.com/question/1397818