The state of plane strain at a point has components of $\epsilon_x = 220(10^{-6})$, $\epsilon_y = -100(10^{-6})$, $\gamma_{xy} = -100(10^{-6})$ as shown in the figure.
(a) Using Mohr's circle, determine the state of strain ($\epsilon_{xx}$, $\epsilon_{yy}$, $\gamma_{xy}$) on an element oriented 30° clockwise from this position. Represent the state of strain on the element. (5 pts)
(b) Using Mohr's circle, determine the principal strains ($\epsilon_1$, $\epsilon_2$) and the orientation of the element ($\theta_{p1}$, $\theta_{p2}$) upon which they act. Specify the point corresponding to the principal strains, on the Mohr's circle (5 pts)