
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 cylinder has a base radius $r$. This cylinder is cut by a plane not parallel to the base such that the shortest side length of the remaining cylinder is $a$ and the longest side length is $b$. What is the volume $\mathrm{s}$ and the surface area of the lateral surface of this obliquely cut cylinder?

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