How to find CDF on disk

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Let $Z = (X, Y)$ be a random variable uniform inside circle of radius $R$. How to find cumulative distribution function (CDF) on disk?

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Hint

See the figure below:

enter image description here

By the definition of the uniform distribution the CDF can be calculated as follows:

$$P(X<x,Y<y)=\frac{\text{red area(x,y)}}{R^2\pi}$$