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BieberJustin

  • 3 years ago

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

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  1. Decart
    • 3 years ago
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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

  2. Decart
    • 3 years ago
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    \[2l+2w=perimeter\]

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

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

  5. BieberJustin
    • 3 years ago
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    how do i get the lenght??

  6. Decart
    • 3 years ago
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    what do you get

  7. Decart
    • 3 years ago
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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

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

  9. Decart
    • 3 years ago
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    yes

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

  11. BieberJustin
    • 3 years ago
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    so what is the p??

  12. BieberJustin
    • 3 years ago
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    thanks!

  13. Decart
    • 3 years ago
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    2l+2w=perimeter

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