Results 1 to 2 of 2

Math Help - trig problem

  1. #1
    Junior Member
    Joined
    Feb 2009
    Posts
    34

    Post trig problem

    2. a schematic diagram of a pedestrian overpass is shown in the figure. If you walk on the overpass from one end to the other, how far have you walked? see attachment for details.
    For this one , the awswer should be greater than 200 ft , yet my anwser is equal to 114.06 ft . Any help would be appreciated!
    please don't use either law of sines or law of cosines to solve this problem ! Thanks
    Attached Thumbnails Attached Thumbnails trig problem-img029.jpg  
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Banned
    Joined
    Aug 2008
    Posts
    530
    Quote Originally Posted by vance View Post
    2. a schematic diagram of a pedestrian overpass is shown in the figure. If you walk on the overpass from one end to the other, how far have you walked? see attachment for details.
    For this one , the awswer should be greater than 200 ft , yet my anwser is equal to 114.06 ft . Any help would be appreciated!
    please don't use either law of sines or law of cosines to solve this problem ! Thanks
    Let x be the first slaned distance (hypotenuse) travelled in 15 degree triangle. Let y be horizontal distance

     \sin 15^{\circ} = \frac{18}{x}

    x = 69.546 ft

     \tan 15^{\circ} = \frac{18}{y}

    y = 67.177 ft

    Let m be the second slaned distance (hypotenuse) travelled in 21 degree triangle. Let n be horizontal distance of triangle.

     \sin 21^{\circ} = \frac{18}{m}

    m = 50.228 ft

     \tan 21^{\circ} = \frac{18}{n}

    n = 46.892 ft

    The middle horizontal distance travelled = 200 - 67.177 - 46.892 = 85.931 ft

    Total distance travelled on bridge = 69.546 + 85.931 + 50.228 = 205.705 ft
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Trig word problem - solving a trig equation.
    Posted in the Trigonometry Forum
    Replies: 6
    Last Post: March 14th 2011, 08:07 AM
  2. Replies: 3
    Last Post: January 2nd 2011, 09:20 PM
  3. Trig. Problem
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: January 21st 2010, 03:13 PM
  4. trig problem
    Posted in the Trigonometry Forum
    Replies: 3
    Last Post: December 10th 2008, 05:23 AM
  5. trig problem
    Posted in the Math Topics Forum
    Replies: 2
    Last Post: April 1st 2008, 03:16 AM

Search Tags


/mathhelpforum @mathhelpforum