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Evaluate the stiffness matrix and element stresses ${}_x,{}_y,{}_{xy},{}_1,$ and ${}_2$ and the principal angle ${}_p$ for a triangular elements with the following information. The coordinates are in units of inches. Assume plane stress conditions. Let

Coordinates of node $1$: $(2,2)$

Coordinates of node $2$: $(3\mathrm{.}2,2)$

Coordinates of node $3$: $(2,3)$

Dispacements at node $1$: $(0\mathrm{.}000,0\mathrm{.}0025)$

Dispacements at node $1$: $(0\mathrm{.}0012,0\mathrm{.}000)$

Dispacements at node $1$:$(0\mathrm{.}0\mathrm{.}00,0\mathrm{.}0025)$

$E=30{10}^6$

thickness $t=1$ in

$v=0\mathrm{.}25$