Answer:
![FH=16\ units](https://img.qammunity.org/2021/formulas/mathematics/middle-school/13rppp7u50bfhju4fapvht3hec43je83q4.png)
Explanation:
we know that
An isosceles triangle has two equal sides and two equal interior angles
In this problem
Triangle FGH is an isosceles triangle,
because
---> given problem
---> given problem
so
![m\angle GFH=m\angle GHF](https://img.qammunity.org/2021/formulas/mathematics/middle-school/rkxyfwadgcfz8b3t1rcjja7x903ev68h92.png)
therefore
FG=HG
substitute the given values
![3x-8=16](https://img.qammunity.org/2021/formulas/mathematics/middle-school/8lk5cvn6qpzr5o7m2426ggt9dydvrvf91z.png)
solve for x
![3x-8=16](https://img.qammunity.org/2021/formulas/mathematics/middle-school/8lk5cvn6qpzr5o7m2426ggt9dydvrvf91z.png)
![3x=16+8](https://img.qammunity.org/2021/formulas/mathematics/middle-school/ir4p6f16jz4w6vx060m7wr41l6cq2q52ln.png)
![3x=24](https://img.qammunity.org/2021/formulas/mathematics/middle-school/ostxi71kh05ntki5khgcn8isjh3xaoufkf.png)
![x=8](https://img.qammunity.org/2021/formulas/mathematics/middle-school/eubtzoilwcpy5phrh05m4p6y4hzzjhe5fz.png)
GJ divide triangle FGH into two congruent triangles
FGJ≅HGJ
If two figures are congruent, then its corresponding sides and its corresponding angles are congruent
so
HJ=FJ
FH=2FJ
FH=2x
substitute the value of x
![FH=2(8)=16\ units](https://img.qammunity.org/2021/formulas/mathematics/middle-school/zlso71ii5klmiwx7kryjpohxeze9m1ix40.png)