Answer :
AB= 3
You can use the proportion ED/DC= AB/BC
That will give you 2/6 = x/9 you can simplify 2/6 to be 1/3 and then you get 1/3 = x/9 and since 3x3= 9 1x3= 3
You can use the proportion ED/DC= AB/BC
That will give you 2/6 = x/9 you can simplify 2/6 to be 1/3 and then you get 1/3 = x/9 and since 3x3= 9 1x3= 3