
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Let \( \triangle ABC \) be a triangle with \(\angle A = 90^\circ\), \(AB = 1\), and \(AC = 2\). Let \(\ell\) be a line through \(A\) perpendicular to \(BC\), and let the perpendicular bisectors of \(AB\) and \(AC\) meet \(\ell\) at \(E\) and \(F\), respectively. Find the length of segment \(EF\).

Present the answer in LaTex format: \boxed{Your answer}
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