
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 cross-section of a pyramid, parallel to the base, divides the pyramid into two parts. If the ratio of the cross-sectional area to the base area is 4:9, then find the ratio of the lengths of the upper and lower parts of the lateral edge.

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