The greatest area of water she can enclose is 2500 m².
A rectangle is a 2-dimensional quadrilateral with four right angles.
Perimeter of a rectangle = 2 x (length + width)
Area of a rectangle = length x width
In order to determine the greatest area of water the lifeguard can enclose, we have t determine the sum of the dimensions.
200m = 2( l + b)
l + b = 200m / 2
l + b = 100m
The second step is to determine the pair of dimensions that add up to 100.
90 x 10 = 900
80 x 20 = 1600
70 x 30 = 2100
60 x 40 = 2400
50 x 50 = 2500
To learn more about the perimeter of a rectangle, please check: brainly.com/question/18793958?referrer=searchResults
