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rebecca1233

  • one year ago

A polygon has an area of 100 square inches and one of its sides is 20 inches long. If a second similar polygon has an area of 36 square inches, what is the length of the corresponding side in the second polygon? 5 in 8 2/3 in 12 in 33 1/3 in

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  1. rebecca1233
    • one year ago
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    @erdog82

  2. erdog82
    • one year ago
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    ok so, I believe you need to st up a proportion

  3. rebecca1233
    • one year ago
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    can u help me please

  4. erdog82
    • one year ago
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    ok I am trying to..

  5. erdog82
    • one year ago
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    so you know the areas of each polygon, right?

  6. rebecca1233
    • one year ago
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    36?

  7. erdog82
    • one year ago
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    and what?

  8. rebecca1233
    • one year ago
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    100?

  9. erdog82
    • one year ago
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    yes, good :)

  10. rebecca1233
    • one year ago
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    so what now ?

  11. erdog82
    • one year ago
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    |dw:1358803903084:dw|

  12. erdog82
    • one year ago
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    solve for x

  13. erdog82
    • one year ago
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    do you need help? Because I am trying to help you.

  14. Mertsj
    • one year ago
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    Not one of the choices.

  15. rebecca1233
    • one year ago
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    yes please help

  16. erdog82
    • one year ago
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    did you see the drawing?

  17. erdog82
    • one year ago
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    ?

  18. rebecca1233
    • one year ago
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    yes i saw it..

  19. erdog82
    • one year ago
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    try solving for x

  20. rebecca1233
    • one year ago
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    100x = 36*20?

  21. erdog82
    • one year ago
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    yup.

  22. rebecca1233
    • one year ago
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    720 = 100x

  23. rebecca1233
    • one year ago
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    then i divided and i got 7.2 but thats not one of the option choices..

  24. erdog82
    • one year ago
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    |dw:1358804299965:dw|

  25. erdog82
    • one year ago
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    oh yeah, what the heck?

  26. Mertsj
    • one year ago
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    Sorry but the ratio of the sides squared would be the ratio of the areas. And so the square root of the ratio of the areas would be the ratio of the sides.

  27. erdog82
    • one year ago
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    huh?

  28. Mertsj
    • one year ago
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    So if the ratio of the areas is 36/100, the ratio of the sides is 6/10

  29. rebecca1233
    • one year ago
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    7.2 is not an option for the answer.. answer options r .. 5 in. 8 2/3 in 12 in and 33 1/3 in

  30. erdog82
    • one year ago
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    @Mertsj you can help @rebecca1233 now... I guess you are better at this than I am

  31. Mertsj
    • one year ago
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    6/10=x/20 Solve that if you want the answer.

  32. rebecca1233
    • one year ago
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    so 6x= 10*20?

  33. rebecca1233
    • one year ago
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    help me ?

  34. rebecca1233
    • one year ago
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    hello @Mertsj

  35. Mertsj
    • one year ago
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    \[\frac{6}{10}=\frac{x}{20}\]

  36. Mertsj
    • one year ago
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    Can you solve that proportion?

  37. rebecca1233
    • one year ago
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    so 6 *20

  38. rebecca1233
    • one year ago
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    hen divie by 1 which gives u 12

  39. rebecca1233
    • one year ago
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    12 in is correct answer right?

  40. Mertsj
    • one year ago
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    yes

  41. rebecca1233
    • one year ago
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    i need help with another problem please

  42. Mertsj
    • one year ago
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    Post it. Someone will reply.

  43. rebecca1233
    • one year ago
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    http://openstudy.com/study#/updates/50fdb892e4b00c5a3be598a7

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