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anonymous

  • one year ago

What is the area of the polygon shown below? http://prntscr.com/7anhsw

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  1. JoannaBlackwelder
    • one year ago
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    Can you split the figure into two rectangles?

  2. anonymous
    • one year ago
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    Idk what you mean by that

  3. JoannaBlackwelder
    • one year ago
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    |dw:1432882152651:dw|

  4. JoannaBlackwelder
    • one year ago
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    |dw:1432882192457:dw|

  5. JoannaBlackwelder
    • one year ago
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    See how I cut the figure into two rectangles?

  6. anonymous
    • one year ago
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    Mhm where would the units go now?

  7. JoannaBlackwelder
    • one year ago
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    What do you think? Give it a shot using my drawing :-)

  8. anonymous
    • one year ago
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    |dw:1432882383425:dw|

  9. anonymous
    • one year ago
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    I doubt that is it

  10. JoannaBlackwelder
    • one year ago
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    That looks great overall! Can you find the area of the big rectangle?

  11. anonymous
    • one year ago
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    126?

  12. JoannaBlackwelder
    • one year ago
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    Yep, perfect!

  13. JoannaBlackwelder
    • one year ago
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    There is one more length that you didn't draw that is important. Any ideas on what that is?

  14. JoannaBlackwelder
    • one year ago
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    *that you didn't label

  15. anonymous
    • one year ago
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    The length of the small square

  16. anonymous
    • one year ago
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    Rectangle*

  17. JoannaBlackwelder
    • one year ago
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    Yep. Any ideas on that?

  18. anonymous
    • one year ago
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    8?

  19. JoannaBlackwelder
    • one year ago
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    Hm, no, that's not what I get.|dw:1432882744702:dw| So, the total is 18, and those two pieces are labelled.

  20. anonymous
    • one year ago
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    Idk Im stumped with this one, my next guess would be half if 18 or 9

  21. JoannaBlackwelder
    • one year ago
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    No, the smaller pieces add up to the whole side. So, 5+x+8=18

  22. JoannaBlackwelder
    • one year ago
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    Do you see how I got the equation?

  23. anonymous
    • one year ago
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    Slightly, so the length of the small rectangle woulf be 5?

  24. JoannaBlackwelder
    • one year ago
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    Yep :-)

  25. JoannaBlackwelder
    • one year ago
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    So, what is the area of the bottom rectangle?

  26. anonymous
    • one year ago
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    20?

  27. JoannaBlackwelder
    • one year ago
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    Nice! So, what is the area of the whole figure?

  28. anonymous
    • one year ago
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    Would I multiply the two areas together?

  29. JoannaBlackwelder
    • one year ago
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    No, sum them.

  30. anonymous
    • one year ago
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    So my total area would be 146

  31. JoannaBlackwelder
    • one year ago
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    Yep :-)

  32. anonymous
    • one year ago
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    Thanks!

  33. JoannaBlackwelder
    • one year ago
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    You're welcome!

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