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Two forces are applied as shown to the corners $\backslash ($ B $\backslash )$ and $\backslash ($ D $\backslash )$ of a rectangular plate. Given: $\backslash ($ P$=86\backslash$mathrm$\{$~N$\}\backslash ).$

Use the result obtained to determine the perpendicular distance between lines $\backslash ($ B E $\backslash )$ and $\backslash ($ D F $\backslash ).$ The perpendicular distance is $\backslash (\backslash$square $\backslash )$ mm $.$