Math

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 whole-number 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?

1. 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!!!!!!'!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

posted by Gabby
2. The square root of 225 is 15.

Perimeter = 4s

P = 2L + 2W

posted by Ms. Sue
3. I don't get it though can you be more specific?

posted by Gabby
4. What about the second one?

posted by Gabby

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

posted by Ms. Sue

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