How wide a strip must be left for planting flowers around a square garden of 20m on each side so that at least one-half of the garden is for flowers?
Ag=20 * 20 = 400 m^2. = Area of garden.
As = 400/2 = 200 m^2. = Area of strip.
L^2 = 200m^2
L = 14.14 m. = Length of each side of
unused portion of garden.
W + L + W = 20 m.
W + 14.14 + W = 20.
2W = 20-14.14 = 5.86
W = 2.93 m. = Width of strip.