[![enter image description here](https://i.stack.imgur.com/Zinsp.png)](https://i.stack.imgur.com/Zinsp.png)

I am trying to understand $P(A|B)$ in practice. I know that $(A,B)$ is the intersection between $A$ and $B$ on the diagram, and I know as well that $P(A|B)$ is probability of $A$ given $B$. But where is $P(A|B)$ on the diagram ?