The structure shown above is in static equilibrium. The structure is made of square segments $1\mathrm{.}0$ m on each side. Support $\backslash ($ A $\backslash )$ is a pin joint and support $\backslash ($ B $\backslash )$ is on rollers. An external force $\backslash (\backslash$mathrm$\{$F$\}=450\mathrm{.}0\backslash$mathrm$\{$~N$\}\backslash )$ is applied to the structure. What is the reaction force at B $?$

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units