The figure shows three forces acting on a joint of a structure. The magnitude of $\mathbf{F}_C$ is $60 \mathrm{kN}$, and $\mathbf{F}_A+\mathbf{F}_B+\mathbf{F}_C=\mathbf{0}$. What are the magnitudes of $\mathbf{F}_A$ and $\mathbf{F}_B$ ?
(FIGURE CAN'T COPY)