
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]


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A regular pentagon is inscribed in the ellipse whose equation is $x^2 + 9y^2 = 9$. One vertex of the pentagon is $(0, 1)$, and one altitude is contained in the y-axis. Find the square of the length of each side of the pentagon.

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