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Step-by-step explanation:
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Answer:
1/5
Step-by-step explanation:
The other answers (in order) equal 5, 1 and 1/5, and 2, so the only other option left is 1/5.
We have a law in geometry called ((power of a node)) the formula is:

according to the formula:
9(FD)=12^2 ==> FD=144/9=16