If $X$ and $Y$ have a bivariate normal distribution with $\mu(x)=\mu(y)=0$, $\rho=0$, $\sigma(x)=\sigma(y)=10$. Find the following:
A) The probability of getting a point $(x,y)$ inside the circle $x^2+y^2=25$.
B) The value of $c$ for which the probability of getting a point inside a square with side of length $c$ centered at the origin is $0.49$.
Already found A, need help with B please!