
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
In a diagram, $\triangle PQR$, $\triangle QRS$, and $\triangle RST$ are right-angled at $Q$, $R$, and $S$ respectively, with $\angle PRQ = \angle QRS = \angle RST = 60^\circ$, and $PR=18$. 
- **Find the area of quadrilateral $PQST$.**

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