For a complex state of stress, the radius of the Mohr's circle is: (a) (0.5left[left(sigma_{x}-sigma_{y} ight)^{2}+4 tau_{x

For a complex state of stress, the radius of the Mohr's circle is:

(a) \(0.5\left[\left(\sigma_{x}-\sigma_{y}\right)^{2}+4 \tau_{x y}{ }^{2}\right]^{1 / 2}\)

(b) \(\left[\left(\sigma_{x}-\sigma_{y}\right)^{2}+4 \tau_{x y}{ }^{2}\right]^{1 / 2}\)

(c) \(0.5\left[\left(\sigma_{x}-\sigma_{y}\right)^{2}+\tau_{x y}{ }^{2}\right]^{1 / 2}\)

(d) \(\left[\left(\sigma_{x}-\sigma_{y}\right)^{2}+\tau_{x y}{ }^{2}\right]^{1 / 2}\)