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BieberJustin

what is the perimeter and lenght of a rectangle if area=515.97 and width=18.9 ....???

  • one year ago
  • one year ago

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  1. Decart
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    2widths and 2lenghts give perimeter. and length times width is area you have to unkowns in two equations solve for one then substitute

    • one year ago
  2. Decart
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    \[2l+2w=perimeter\]

    • one year ago
  3. Decart
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    \[lw=area(515.97)\]

    • one year ago
  4. Decart
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    substitute 18.9 for w and solve for l in the second equation

    • one year ago
  5. BieberJustin
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    how do i get the lenght??

    • one year ago
  6. Decart
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    what do you get

    • one year ago
  7. Decart
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    in the second equation lenght times width equalls area subtitute 18.9 then solve for l by dividing both sides of the equation by w

    • one year ago
  8. BieberJustin
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    is it right?? i get 27.3 for the leght... can you please check it if it is right... :d

    • one year ago
  9. Decart
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    yes

    • one year ago
  10. Decart
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    now substitute l and w in the first equation to get the perimeter.

    • one year ago
  11. BieberJustin
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    so what is the p??

    • one year ago
  12. BieberJustin
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    thanks!

    • one year ago
  13. Decart
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    2l+2w=perimeter

    • one year ago
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