The answer would be B) AD=DC, the reason why is because line AD is a reflection of line DC
Answer:
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Answer:

Step-by-step explanation:

You can use the Pythagorean theorem, a^2+b^2=c^2, to solve this.
b= square-root of (c^2)-(a^2)
b= square-root of (9^2)-(2^2)
b= 8.77.... which in the exact form is square root of 77.