Please fast see the pic i need help

AC = 6 cm

Step-by-step explanation:

First, realize that these are two identical triangles. We just have to use the pythaogrean theorem on one side to find AD or DC, then multiply that by 2 to get AC.

a^2 + b^2 = c^2

8^2 + b^2 = 10^2

64 + b^2 = 100

100 - 64 = b^2

b^2 = 36

b = 6

d. bc = 12 and ef = 16

step-by-step explanation:

we are given that δabc : δdef such that .

also, it is given that

so, from the options, we need that .

a.

b.

c.  

d.

as, we can see that only option d gives the same ratio as i.e. .

hence, the possible lengths are bc = 12 and ef = 16.

the answer is 11.2 (i know i’m late)