(Solved): please clear previous it was wrong
2. Let \( f_{X, Y}(x, y)=\frac{1}{\pi} I_{D}(x, y) \) where \( D ...
please clear previous it was wrong
2. Let \( f_{X, Y}(x, y)=\frac{1}{\pi} I_{D}(x, y) \) where \( D=\left\{(x, y): x^{2}+y^{2} \leq 1\right\} \) and let \( Z=\sqrt{X^{2}+Y^{2}} \). a) Find and sketch \( f_{Z} \). b) Find \( P(\{0.25