
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 rectangle with perimeter 30 cm is divided by two lines, forming a square of area 9 cm². What is the perimeter of the shaded rectangle?

A) 14 cm  
B) 16 cm  
C) 18 cm  
D) 21 cm  
E) 24 cm

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