Math
posted by Gabby .
The first question is this:
Helen designs a rectangle with an area of 225 square units. Her rectangle is the largest rectangle (that is, with largest area) with wholenumber side lengths that can be made from the perimeter of the rectangle.
A. Whay are the length and width of the rectangle?
B.what is the perimeter of the rectangle?
The second question is this:
Corinda has 400 ft of fencing to make a play area. She wants the fenced area to rectangular. What dimensions should she use in order to enclose the maximum possible area?

I know that the answers for the question 1 is length=15 and width=15 and perimeter=60 but o don't know how to get that answer.
For the second question I know that the answer is 100 by 100 the dimensions but I don't know how to get that either. Please help!!!!!!'!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 
The square root of 225 is 15.
Perimeter = 4s
P = 2L + 2W 
I don't get it though can you be more specific?

What about the second one?

This makes me wonder how you got your answers.
You got 15 for the sides of the first one. For a square, you get 15 by taking the square root of the area.
In the second one, the perimeter is 400.
400/4 = 100
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