
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
Given a hyperbola with left and right foci at $F_1$ and $F_2$ respectively, a chord $AB$ on the left branch passing through $F_1$ with a length of 5. If $2a=8$, determine the perimeter of $\triangle ABF_2$.

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