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countonme123

  • 3 years ago

The perimeter of a rectangle field is 60 meters. Its area is 200 square meters. Find its dimensions.

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  1. countonme123
    • 3 years ago
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    Please explain each step. I am having trouble here. :(

  2. countonme123
    • 3 years ago
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    come on guys there has to be at least one nerd here. lol

  3. nenadmatematika
    • 3 years ago
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    |dw:1340060211664:dw|

  4. nenadmatematika
    • 3 years ago
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    so you'll have to solve this system. From the second equation b=30-a so plug it back into the first equation and you'll get this equation:|dw:1340060339958:dw|

  5. nenadmatematika
    • 3 years ago
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    so your rectangle field has sides a=10 b=20 or a=20 b=10

  6. nenadmatematika
    • 3 years ago
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    do you understand this?

  7. countonme123
    • 3 years ago
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    ah so its that parenthese trick thing again where you multiply them and it equal a complicated equation? I think i get it

  8. nenadmatematika
    • 3 years ago
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    haha :D OK...you can think of it in that way...the basics are to know the formulas for area and perimeter of rectangle...then just to combine those two...I hope I helped you :D

  9. countonme123
    • 3 years ago
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    the only part i dont get is why you changed the 60 to 30

  10. nenadmatematika
    • 3 years ago
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    formula for the perimeter is 2(a+b) where a and b are lengths of sides...you have its value 60...so a+b=60/2=30...get it? :D

  11. countonme123
    • 3 years ago
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    ok got that ok what about the term you added after that?

  12. nenadmatematika
    • 3 years ago
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    a+b=30, so you can express one side by using the other side,so a=30-b....that's the connection between those two sides...so I plugged back 30-b instead of a in the first equation...that's how I got the quadratic equation which gives you the exact solution....

  13. countonme123
    • 3 years ago
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    hmmm, I still don't get why you added the term -a^2

  14. nenadmatematika
    • 3 years ago
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    how would you multiply a*(30-a)?

  15. countonme123
    • 3 years ago
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    why would you multiplay it by a? a^2 - 30a

  16. countonme123
    • 3 years ago
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    there must be something im missing cause i kinda get you...

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