
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
A block of metal is shaped like a right circular cylinder with a radius of $8$ cm and a height of $10$ cm, and its entire surface is painted red. Points $P$ and $Q$ are chosen on the edge of one of the circular faces such that the arc $\overarc{PQ}$ measures $90^\text{o}$. The block is then cut in half along the plane that passes through points $P$, $Q$, and the center of the cylinder, revealing a flat, unpainted face on each half. Calculate the area of one of these unpainted faces, expressed as $d\cdot\pi + e\sqrt{f}$, where $d$, $e$, and $f$ are integers and $f$ is not divisible by the square of any prime. Find $d+e+f$.

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