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January 30, 2015

January 30, 2015

Posted by **idk** on Tuesday, February 19, 2013 at 12:48am.

1. Describe the dimensions she should us to build the are. use whole numbers only

2. How much fencing wil she need

3. Explain how you found that answer?

- math -
**Reiny**, Tuesday, February 19, 2013 at 9:08amI largest area of a rectangle is obtained when that rectangle is a square, so

x^2 = 48

x = √48 = 4√3 = appr 6.9 or 7 as a whole number.

She will need 4(7) or 28 ft of fencing

If the rectangle is 6 ft by 8 ft, then the area will be exactly 48 ft^2

and the perimeter would be 2(6) + 2(8) = 28 ft

notice that if the rectangle is 7 by 7, we get an area of 49 ft^2, so using the same perimeter as the 6 by 8 rectangle we get a larger area.

Either way, the least amount of fencing she needs is 28 ft

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