Look at the picture.
ΔABD and ΔBCD are similar, therefore:

Use Pythagorean theorem:
2481.7
^ is the tenth place.
The 5 would either round it up or down by one-tenth. Since we like big numbers... we'll round it to 7 from 6.
Answer:
I do not know
Step-by-step explanation:
1234588999
The answer is the first one , A