Anyone think they could help me with this ?

10

Step-by-step explanation:

As we can see in hint through it we can identify that it is right angled triangle so here

AB = 6

FE = BC ( being corresponding sides of congruent triangle)

BC = 8

Now In triangle ABC

perpendicular (p) = 6

base (b) = 8

hypotenuse (h) = ?

By using Pythagoras theorem we get

h = √ p² + b²

= √ 6² + 8²

= √ 100

= 10

So Now

AC = h = 10

Hope it will help :)

both equations and proportions are better.