anonymous
  • anonymous
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.
Mathematics
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anonymous
  • anonymous
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.
Mathematics
jamiebookeater
  • jamiebookeater
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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anonymous
  • anonymous
I will post some pictures of the graph and my working out now too...
ganeshie8
  • ganeshie8
|dw:1441637453103:dw|
anonymous
  • anonymous
Yes, thats the graph!

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anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
And here's my working out.
anonymous
  • anonymous
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.
ganeshie8
  • ganeshie8
I see why, you have picked wrong coordinates you should be taking the coordinates of B, not A
ganeshie8
  • ganeshie8
|dw:1441638171968:dw|
anonymous
  • anonymous
Oh my word. Thank you! Sorry for taking up your time :)
anonymous
  • anonymous
I make silly mistakes like that often. Oh well, nothing for it but practice I guess.
ganeshie8
  • ganeshie8
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
anonymous
  • anonymous
I don't think I am. At least, I had to google what that is :)
anonymous
  • anonymous
I think it comes up later in my syllabus.

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