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Posted by on Thursday, February 11, 2010 at 12:20pm.

a tunnel under a river is 196.8 ft below the surface at its west point. if the angle of depression of the runnel is 4.962 then how far apart on the surface are entrances to the tunnel? how long is tunnel

  • math - , Thursday, February 11, 2010 at 1:52pm

    Assume a V-shaped profile,with the low point in the middle of the tunnel. If the tunnel length is L,
    tan 4.962 = 196.8 ft/(L/2)
    0.08682 *L/2 = 196.8
    Solve for L

  • math - , Tuesday, June 29, 2010 at 10:00pm


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