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Thread: grid reference problem

  1. #1

    Question grid reference problem

    A map usesgrid references for positions. A grid reference for a point of 987654 means the
    point is 987 m East and 654 m North of the fixed referencepoint.
    A bridge FG crosses a river.
    The length of the bridge is 24 m.
    Angle GFH is 36˚.
    The grid reference for F is 163871.
    2ev6wbs.jpg


    Find the grid reference for the end of the bridge at G.

  2. #2
    Elite Member
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    Quote Originally Posted by susumandrai View Post
    A map usesgrid references for positions. A grid reference for a point of 987654 means the
    point is 987 m East and 654 m North of the fixed referencepoint.
    A bridge FG crosses a river.
    The length of the bridge is 24 m.
    Angle GFH is 36˚.
    The grid reference for F is 163871.
    2ev6wbs.jpg


    Find the grid reference for the end of the bridge at G.
    Assume:

    <GFH = Θ

    then

    FH = FG * cos(Θ)....... and continue......

    Please share your work with us, indicating exactly where you are stuck - so that we may know where to begin to help you.
    “... mathematics is only the art of saying the same thing in different words” - B. Russell

  3. #3
    Elite Member mmm4444bot's Avatar
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    You forgot to include your question about this exercise!

    What do you need? Where are you stuck? What have you tried, thus far?

  4. #4
    Quote Originally Posted by mmm4444bot View Post
    You forgot to include your question about this exercise!

    What do you need? Where are you stuck? What have you tried, thus far?

    Please tell me if this answer is correct:
    FH = 24cos 36 = 19.4
    GH = 24sin 36 = 14.1

    Grid reference for F is 163871
    So 163 + 19.4 = 182.2 so I take the easting as 182
    871 + 14.1 = 885.1 so I take the northing as 885
    I rounded down in both cases


    Therefore Grid reference = 182885

  5. #5
    Elite Member mmm4444bot's Avatar
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    Quote Originally Posted by susumandrai View Post

    Please tell me if this answer is correct:

    Grid reference = 182885
    Looks good to me.

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