
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 the Cartesian coordinate system $xOy$, the parametric equation of curve $C_1$ is $\begin{cases} x=t^{2} \\ y=2t \end{cases}$ (where $t$ is the parameter), and in the polar coordinate system with the origin $O$ as the pole and the positive $x$-axis as the polar axis, the polar equation of curve $C_2$ is $\rho=5\cos \theta$.  
$(1)$ Write the polar equation of curve $C_1$ and the Cartesian coordinate equation of curve $C_2$;  
$(2)$ Let the intersection of curves $C_1$ and $C_2$ in the first quadrant be point $A$, and point $B$ is on curve $C_1$ with $\angle AOB= \frac {\pi}{2}$, find the area of $\triangle AOB$.

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