A $\text{2D}$ state of stress at a point in a body is given by $\sigma_{x x}=-40 \mathrm{~MPa}$, $\sigma_{y y}=100 \mathrm{~MPa}$ and $\tau_{x y}=50 \mathrm{~MPa}$.
The radius of the Mohr's circle for the given state of stress is $\_\_\_\_$ $\mathrm{MPa}$ (rounded off to two decimal places).
