
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
Given the line $l$: $4x+3y-8=0$ ($a\in R$) passes through the center of the circle $C$: $x^{2}+y^{2}-ax=0$ and intersects the circle $C$ at points $A$ and $B$. $O$ is the coordinate origin.

(I) Find the equation of circle $C$;

(II) Find the equation of the tangent line to circle $C$ at point $P(1, \sqrt {3})$;

(III) Calculate the area of $\triangle OAB$.

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