If I may say y equals to angle R2 I will be wrong??

You would be incorrect to say that $\hat{R}_2 = y$.

Here's why:

Step 1: Identify angles equal to $y$.
We are given $\hat{Q}_3 = y$.
By the Tan-chord theorem, the angle between the tangent TQA and chord QR ($\hat{Q}_3$) is equal to the angle in the alternate segment subtended by the chord QR, which is $\hat{P}_1$.

$$\hat{P}_1 = \hat{Q}_3 = y$$

Also, angles subtended by the same arc are equal. So, $\hat{S}_1$ (subtended by arc QR) is equal to $\hat{P}_1$.

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