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A trigonometry problem :S Watch

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    a ladder 2.5m long leans against a vertical wall so that it makes an angle of 68(degrees) with the horizontal grounf. how far up the wall does the aldder reach ? give your answer to one decimal place.


    ^^ i have worked it out however im not fully convinced that my answer is correct as it looks odd. my answer was 0.9m by using cos
    thankyou for any help.
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    It might be easier just to post your entire homework in one thread
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    BTW your answer is wrong since the wall is OPPOSITE your angle
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    (Original post by silverose)
    a ladder 2.5m long leans against a vertical wall so that it makes an angle of 68(degrees) with the horizontal grounf. how far up the wall does the aldder reach ? give your answer to one decimal place.


    ^^ i have worked it out however im not fully convinced that my answer is correct as it looks odd. my answer was 0.9m by using cos
    thankyou for any help.
    You have found the distance from the wall to the foot of the ladder.

    You need sin and not cos.
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    sin x = opposite/hypotenuse
    sin68= length/2.5

    length=2.5sin68= 2.3m (2sf)
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    (Original post by silverose)
    a ladder 2.5m long leans against a vertical wall so that it makes an angle of 68(degrees) with the horizontal grounf. how far up the wall does the aldder reach ? give your answer to one decimal place.


    ^^ i have worked it out however im not fully convinced that my answer is correct as it looks odd. my answer was 0.9m by using cos
    thankyou for any help.
    See the diagram below:

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    .....
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    #.\
    #...\
    #.....\
    #.......\ 2.5m.......sin68= x/2.5
    #.........\ ............x= 2.5Xsin68
    #...........\...........x=2.3 m (1.dp)
    #_____(68 \
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    (Original post by MarshmallowBob)
    #.\
    #...\
    #.....\
    #.......\ 2.5m.......sin68= x/2.5
    #.........\ ............x= 2.5Xsin68
    #...........\...........x=2.3 m (1.dp)
    #_____(68 \
    I think i posted a better diagram above .
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    (Original post by raheem94)
    See the diagram below:

    This picture made my day.
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    (Original post by raheem94)
    I think i posted a better diagram above .
    Lol i couldnt agree more :P i had wasted a good 5 mins with the diagram, then is saw your post, so i thought might aswell post it.
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    (Original post by myfriendSQRT(-1))
    This picture made my day.
    Lol
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    (Original post by raheem94)
    Lol
    I particularly enjoyed that you clarified where the wall was.
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    (Original post by Hype en Ecosse)
    I particularly enjoyed that you clarified where the wall was.
    How do you enjoy a maths diagram?
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    (Original post by raheem94)
    How do you enjoy a maths diagram?
    The same way you enjoy anything? The notion that you had to clarify that the only vertical structure in the diagram was a wall made me smile.
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    (Original post by Hype en Ecosse)
    The same way you enjoy anything? The notion that you had to clarify that the only vertical structure in the diagram was a wall made me smile.
    I just wanted to label the diagram. However, i didn't labelled the horizontal ground .
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    (Original post by TenOfThem)
    It might be easier just to post your entire homework in one thread
    nobody's forcing you to help me .. don't like the fact that i can't do all my homework by myself but i'm trying to get help then keep scrolling and keep any nasty comments to yourself love.
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    Thankyou so much for the patience with the diagrams guys .. really helped
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    (Original post by silverose)
    nobody's forcing you to help me .. don't like the fact that i can't do all my homework by myself but i'm trying to get help then keep scrolling and keep any nasty comments to yourself love.
    Its not a 'nasty comment'. Why can't you post all the questions in one thread?

    We don't have problem with you not able to do your homework, but you were suggested to post all the questions in one thread rather than making multiple threads.
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    (Original post by silverose)
    nobody's forcing you to help me .. don't like the fact that i can't do all my homework by myself but i'm trying to get help then keep scrolling and keep any nasty comments to yourself love.
    Accidentally neg repped you when I wanted to pos rep you! Sorry
 
 
 
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