A circle whose center is at C(x=-4,y=1) passes through the
point D(x=-2,y=2).
Find the length of the radius.
You may enter a number, an expression such
as 'sqrt()', or an algebraic statement such as '1/sqrt(3**2 + 4^2)', where
we have explicitly shown that either '**' or '^' may be used as a power.