Answer for brainliest answer

labels:
a= top
b= 90 degree
c= bottom
angle a is 45 degrees and the length of ac.

the length of ab √2 or 9√2)
the length of bc √2 or 9√2)
choose one for !
!

chase is right because he already been to the swings and he know how far it will be to get there

step-by-step explanation:

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional