Results 1 to 3 of 3

Thread: [Solved] How to find length AB? quadrilateral w/ diag=640, 2 angles given

  1. #1
    New Member
    Join Date
    Feb 2018
    Posts
    1

    [Solved] How to find length AB? quadrilateral w/ diag=640, 2 angles given

    1-29 A surveying method to find the distance between two points A and B, between which is an obstacle, is shown in Figure P1-29. The length of CD is 640 feet. As an intermediate step of the surveying method, calculate the lengths of AC and AD.

    aaa.jpg



    Hello all, can anyone help me figure this out please?

    So far I've worked out that AC is 914.67 and AD is 866.85 using sine law, but further than this I'm stumped .

    EDIT: Looks like the question didn't ask for the length AB and is unsolvable given the information - it only asks for length AC and AD.
    Last edited by stapel; 02-23-2018 at 03:55 PM. Reason: Typing out the text in the graphic; creating useful subject line.

  2. #2
    Senior Member
    Join Date
    Nov 2017
    Location
    Rochester, NY
    Posts
    1,225
    Quote Originally Posted by Atom View Post
    aaa.jpg
    Hello all, can anyone help me figure this out please?

    So far I've worked out that AC is 914.67 and AD is 866.85 using sine law, but further than this I'm stumped.

    EDIT: Looks like the question didn't ask for the length AB and is unsolvable given the information - it only asks for length AC and AD.
    You're right: The problem is described as an intermediate step in finding AB, and you are not given enough information to go beyond what is explicitly asked. (You would probably be given another angle.)

  3. #3
    Elite Member
    Join Date
    Jun 2007
    Posts
    17,454
    Quote Originally Posted by Atom View Post
    aaa.jpg
    Hello all, can anyone help me figure this out please?

    So far I've worked out that AC is 914.67 and AD is 866.85 using sine law, but further than this I'm stumped.

    EDIT: Looks like the question didn't ask for the length AB and is unsolvable given the information - it only asks for length AC and AD.
    So you have solved the problem!! Watch out for units and significant figures in your answers.
    “... mathematics is only the art of saying the same thing in different words” - B. Russell

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •