• anonymous
one side of a rectangle is 12 and the perimeter is 34. what is the area?
  • katieb
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  • anonymous
  • anonymous
You know the formulas for perimeter and area:\[A=lw\]and\[P=2l+2w\]where l is the length and w the width. You know that one of the dimensions, l or w (it doesn't matter) is 12. You're also given the perimeter, so you can use this information to obtain the other dimension, and therefore, your area. Let's say l=12. Then\[P=34=2w+2(12)=2w+24 \rightarrow w=\frac{34-24}{2}=5\]Therefore, the area is\[A=lw=12 \times 5 = 60\] square units.

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