
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
Martin walks completely around the boundary of a rectangular park, which is 6 km long and 4 km wide. From any point on his path, he can see exactly 0.5 km horizontally in all directions. What is the area of the region consisting of all points Martin can see during his walk?

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