Question

What is the length, in units, of segment CD?

Answer 1

I think the correct answer is CD= 7√2
it is 45:45:90 triangle
which means the answer is x:x:x√2
7:7:7√2

Answer 2

Bud, I have four choices: 6, 8.5, 7, and 9.8.
I have ruled out 6 and 7 given that the adjacent of ADC is the same as the hypotenuse of ABC. Any idea of a dilation factor?

Answer 3

7√2=9.89949 , after simplifying it should be 9.9

but the the closest answer from the options is 9.8