The position vectors of vertices of $\Delta ABC$ are $A$2\hat{i} - \hat{j} + \hat{k}$$, $B$\hat{i} - 3\hat{j} - 5\hat{k}$$ and $C$3\hat{i} - 4\hat{j} - 4\hat{k}$$. Find all the angles of $\Delta ABC$.