$$: $$: VS $$: r$-.)1\backslash$times $10^(5)$N$($m$)/($r$)$ad$,2\backslash$times $10^(5)$N$($m$)/($r$)$ad $4\backslash$times $10^(5)$N$($m$)/($r$)$ad $\backslash$theta $\_(3)=-(\backslash$pi $)/(2),\backslash$theta $\_(2)=3(\backslash$pi $)/(4),\backslash$theta $\_(1)=(\backslash$pi $)/(2)..).1$l$\_(3)=0\mathrm{.}5$m$,$l$\_(2)=1$m$,$l$\_(1)=1$m$,1\backslash$times $10^(5)$N$($m$)/($r$)$ad$,2\backslash$times $10^(5)$N$($m$)/($r$)$ad$4\backslash$times $10^(5)$N$($m$)/($r$)$ad $$d $$