So it's 8√2 cause you do c=a/h and manipulate the formula for 8/cos45 :)
Answer:
See below
Step-by-step explanation:
The initial ordered-pairs are 
We have a rotation of 90 degrees counterclockwise with respect to origin
Note. Previously the points were

After the rotation, we have

Thus, 
Then shifting horizontally to the right 2 units, we get ΔA'B'C'
Thus,

We know that
scale factor=measure triangle DEF/measure triangle ABC
DE/AB=DF/AC=EF/BC
12/72=7/42=11/66-----> 1/6
the answer is
<span>the scale factor of ABC to DEF</span> is 1/6
I’m here to help! ( pssss, the other guy’s answer was trash) Ok:
1) 10+9= 19
2) 8+5= 13
3) 7+2=9
4) 3+9=12
5) 4+1=5
6) 2+4=6
Hope this helps!
~ Your Cookie Monster