if CH=42 m and CF=58m, then what is the length of FG

Let's draw a triangle with points C, F, and G, with CF = 58 m and CH = 42 m.

Since CFH is a right triangle, we can apply the Pythagorean theorem to find the length of FG.

Using Pythagorean theorem, we have:

(FC)^2 = (CH)^2 + (FH)^2
(58)^2 = (42)^2 + (FH)^2
3364 = 1764 + (FH)^2
FH^2 = 1600
FH = 40

So, the length of FG is 40 m.