
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 acute $\triangle ABC$, the sides opposite angles $A$, $B$, and $C$ are denoted as $a$, $b$, and $c$ respectively. It is given that $a= \sqrt {7}$, $b=3$, and $ \sqrt {7}\sin B+\sin A=2 \sqrt {3}$.  
(I) Find the magnitude of angle $A$;  
(II) Find the area of $\triangle ABC$.

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