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anonymous

  • one year ago

Hello! I am getting the wrong answer but I can't see where I am going wrong, please help. 6. You are given the co-ordinates of the four points A(6,2), B(2,4), C(-6,-2) and D(-2,-4). (v) Calculate the area of the figure ABCD. IN the previous questions you find that DA's length is 10 which I use as the 'b' as in base (A=bh) . You also know that a line perpendicular to DA passing through B passes through DA at (4.4,0.8) . I tried using point A and (4.4,0.8) to find the height by finding the length between the two points. I get 2 instead of 4.

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  1. anonymous
    • one year ago
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    I will post some pictures of the graph and my working out now too...

  2. ganeshie8
    • one year ago
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    |dw:1441637453103:dw|

  3. anonymous
    • one year ago
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    Yes, thats the graph!

  4. anonymous
    • one year ago
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    1 Attachment
  5. anonymous
    • one year ago
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    And here's my working out.

  6. anonymous
    • one year ago
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    I drew my graph to scale so when I measure it I can see the answer is 40, not 20, but I cants see why.

  7. ganeshie8
    • one year ago
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    I see why, you have picked wrong coordinates you should be taking the coordinates of B, not A

  8. ganeshie8
    • one year ago
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    |dw:1441638171968:dw|

  9. anonymous
    • one year ago
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    Oh my word. Thank you! Sorry for taking up your time :)

  10. anonymous
    • one year ago
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    I make silly mistakes like that often. Oh well, nothing for it but practice I guess.

  11. ganeshie8
    • one year ago
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    its good to see that you have taken time to graph and compare the areas if you're familiar with vectors/matrices, there is a really nice way to find the area

  12. anonymous
    • one year ago
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    I don't think I am. At least, I had to google what that is :)

  13. anonymous
    • one year ago
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    I think it comes up later in my syllabus.

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spraguer (Moderator)
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