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anonymous

  • one year ago

help plz for medaal

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    @mathstudent55 @LynFran @plzzhelpme

  3. anonymous
    • one year ago
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    @phi

  4. anonymous
    • one year ago
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    @enchiladas

  5. mathstudent55
    • one year ago
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    I see a figure, but I don;t see a question.

  6. anonymous
    • one year ago
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    Find the area of the following shape. You must show all work to receive credit.

  7. anonymous
    • one year ago
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    @mathstudent55

  8. mathstudent55
    • one year ago
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    Your polygon looks like this. |dw:1439511583508:dw|

  9. anonymous
    • one year ago
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    yes

  10. mathstudent55
    • one year ago
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    Separate it into smaller well-known shapes and find their areas. Then add up all the areas. By well-known shapes I mean triangles and a rectangle.

  11. anonymous
    • one year ago
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    can u walk and help me through it

  12. mathstudent55
    • one year ago
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    |dw:1439511729134:dw|

  13. anonymous
    • one year ago
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    ok

  14. mathstudent55
    • one year ago
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    Look above. I divided the shape into 4 triangles and a rectangle.

  15. anonymous
    • one year ago
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    ok i see

  16. mathstudent55
    • one year ago
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    |dw:1439511826496:dw|

  17. mathstudent55
    • one year ago
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    Let's start with the rectangle.

  18. mathstudent55
    • one year ago
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    |dw:1439511982395:dw|

  19. mathstudent55
    • one year ago
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    Notice the height of the rectangle is from -3 to -8 on the y-axis. How far is it from -3 to -8?

  20. mathstudent55
    • one year ago
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    |dw:1439512117708:dw|

  21. mathstudent55
    • one year ago
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    The rectangle is 4 by 5, so the area fo the rectangle is A5 = 4 * 5 = 20

  22. mathstudent55
    • one year ago
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    Now let's look at triangle 1. |dw:1439512204247:dw|

  23. mathstudent55
    • one year ago
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    A1 = bh/2 = 2 * 2 / 2 = 2

  24. mathstudent55
    • one year ago
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    A2 = bh/2 = 4 * 2/2 = 4 |dw:1439512246036:dw|

  25. anonymous
    • one year ago
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    ok

  26. anonymous
    • one year ago
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    is that all

  27. mathstudent55
    • one year ago
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    We still need triangles 3 and 4.

  28. mathstudent55
    • one year ago
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    |dw:1439512375180:dw|

  29. mathstudent55
    • one year ago
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    A3 = bh/2 = 4 * 2/2 = 4 A4 = bh/2 = 8 * 2/2 = 8

  30. anonymous
    • one year ago
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    is the are 20

  31. mathstudent55
    • one year ago
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    Now that we have all the small areas, we can find the total area. A = A1 + A2 + A3 + A4 + A5 = 2 + 4 +4 + 8 + 20

  32. mathstudent55
    • one year ago
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    Just the rectangle in the middle is 20. The total area is the area of the rectangle plus the area of the 4 triangles. Just add up all the numbers above.

  33. anonymous
    • one year ago
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    so its 20

  34. anonymous
    • one year ago
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    40

  35. mathstudent55
    • one year ago
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    Wait. i just noticed a mistake I made. All the triangles are correct, but I didn't use the correct length for the rectangle. The rectangle is 6 by 4, so its area is A = LW = 6 * 4 = 24 The total area is A = 2 + 4 +4 + 8 + 24 A = 42

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