
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
The center of a circle is on the positive half of the $x$-axis, and its radius is the length of the imaginary semi-axis of the hyperbola $\dfrac{x^{2}}{16} - \dfrac{y^{2}}{9} = 1$, and it is tangent to the asymptotes of this hyperbola. The equation of the circle is __________.

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