Question 1181055
triangle SFH is similar to triangle EGL


sides are proportional, so


{{{SH/SF=EL/EG}}}


{{{380/225=EL/180}}}


{{{(380/225)180=EL}}}


{{{EL=304}}}


triangle SIL is similar to triangle SFH , so


{{{SL/SI=SH/SF}}}


{{{(380+304+HE)/700=380/225}}}


{{{684+HE=700(380/225)}}}


{{{684+HE=10640/9}}}


{{{HE=10640/9-684}}}


{{{HE=4484/9}}}


{{{HE=498.22}}}


then the length of the tunnel is {{{498.22m}}}