Results 1 to 7 of 7

Math Help - Measurement

  1. #1
    Newbie
    Joined
    Feb 2008
    Posts
    10

    Measurement

    ok everyone i have a big problem i dont get this question could somebody smart ( most likely everyone here), help me on it it would be nice if they can make a diagram for it in paint and show me it so i know how to make the diagrams aswell thanks! email is brownb01_@hotmail.com

    or u can just post it here what ever is easier for you, ok the question

    Height of a building from the window of one building, Sam finds the angle of elevation of the top of a second building is 41(degrees) and the angle of depression of the bottom is 54(degrees) the buildings are 56m apart. find, to the nearest metre,

    a) the height of the second building



    please explain how you got the answer, i already know the answer, thanks alot Ladies and Gentlemen.

    also can some one tell me the rules of the degrees like the corresponding like if the make a Z then the degrees are the same can someone tell me them all thanks.. !
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Member Jonboy's Avatar
    Joined
    May 2007
    From
    South Point
    Posts
    193
    could you re-write the problem more clear? that's one long sentence right here:

    "Height of a building from the window of one building, Sam finds the angle of elevation of the top of a second building is 41(degrees) and the angle of depression of the bottom is 54(degrees) the buildings are 56m apart."
    Follow Math Help Forum on Facebook and Google+

  3. #3
    Newbie
    Joined
    Feb 2008
    Posts
    10
    from the window of one building, Sam finds the angle of elevation of the top of a second building is 41(degrees) and the angle of depression of the bottom is 54(degrees) the buildings are 56m apart. find, to the nearest metre,

    a) the height of the second building




    directly from the textbook hope its understandable now
    Follow Math Help Forum on Facebook and Google+

  4. #4
    Member Jonboy's Avatar
    Joined
    May 2007
    From
    South Point
    Posts
    193
    i think i might understand it now.

    here's a picture for ya:



    So AD = 56

    Use your Right Triangle Trig Functions to get the length of BD, then DC, add them together and you have the length of the second building.

    For checking purposes, I'll show you what you should get.

    If we start at \angle DAB, we know the adjacent side.

    We need the opposite side. So use Tan

    Tan\,54 = \frac{BD}{56}

    Criss-Cross Multiply: BD = (Tan\,54)(56)

    Then go to \angle DAC

    Once again, use Tan

    Tan\,41 = \frac{CD}{56}

    CD = (Tan\,41)(56)

    So: BC = (Tan\,54)(56) + (Tan\,41)(56)

    Now round it to the nearest meter.
    Follow Math Help Forum on Facebook and Google+

  5. #5
    Newbie
    Joined
    Feb 2008
    Posts
    10
    wow thanks so much, the answer is correct, but i cannot see the picture can you some how email it as an attachment? pleaseee i triedd using the link but it says 504 gateway timeout. also i was wondering can you explain depression and elevation to me (the rules for it)
    Follow Math Help Forum on Facebook and Google+

  6. #6
    Member Jonboy's Avatar
    Joined
    May 2007
    From
    South Point
    Posts
    193
    i'll attach the picture on this post.

    the angle of depression and elevation are both the angle between the horizontal line and the line of sight.

    the line of sight has a positive slope for the angle of elevation, while the line of sight has a negative slope for the angle of depression.

    the horizontal line can be thought of as the line that is made as if the person is looking straight ahead.
    Attached Thumbnails Attached Thumbnails Measurement-brownb01.jpg  
    Follow Math Help Forum on Facebook and Google+

  7. #7
    Newbie
    Joined
    Feb 2008
    Posts
    10
    wow LOL my diagram was so close to yours, i jus had the degrees at Angle B and C instead of the top thanks alot man have a good day.
    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. measurement to all angles
    Posted in the Geometry Forum
    Replies: 1
    Last Post: December 8th 2010, 08:49 AM
  2. Angle Measurement
    Posted in the Trigonometry Forum
    Replies: 1
    Last Post: August 24th 2009, 09:53 PM
  3. Measurement question
    Posted in the Algebra Forum
    Replies: 1
    Last Post: November 17th 2008, 03:53 PM
  4. How do I get the measurement?
    Posted in the Geometry Forum
    Replies: 4
    Last Post: July 12th 2007, 04:50 AM
  5. measurement
    Posted in the Algebra Forum
    Replies: 1
    Last Post: May 23rd 2007, 07:44 AM

Search Tags


/mathhelpforum @mathhelpforum