Respuesta :
To minimize the perimeter you should always have a square.
sqrt(289) = 17
The dimensions should be 17 X 17
To see , try starting at length 1, and gradually increase the length.
The height decreases at a faster rate than the length increases, up until you reach a square.
Or if you want to use algebra, Say the width is 17-x
Then the length is 289/(17-x)
Now, this is bigger than 17+x, as shown here:
289/(17-x) > 17+x
289 > 289 - x^2
which is true.
so the perimeter would be bigger than 2 * (17- x + 17 + x) = 2 * (2 * 17) = 4 * 17
Again, the dimensions should be a square. 17 X 17.
sqrt(289) = 17
The dimensions should be 17 X 17
To see , try starting at length 1, and gradually increase the length.
The height decreases at a faster rate than the length increases, up until you reach a square.
Or if you want to use algebra, Say the width is 17-x
Then the length is 289/(17-x)
Now, this is bigger than 17+x, as shown here:
289/(17-x) > 17+x
289 > 289 - x^2
which is true.
so the perimeter would be bigger than 2 * (17- x + 17 + x) = 2 * (2 * 17) = 4 * 17
Again, the dimensions should be a square. 17 X 17.
The minimum perimeter of the rectangle with an area of 289 square inches is 68 inches.
Let x represent the length of the rectangle and y represent the width of the rectangle.
Since the area is 289 square inches, hence:
xy = 289
y = 289/x
The perimeter of the rectangle is:
Perimeter (P) = 2(x + y)
P = 2(x + 289/x)
P = 2x + 578/x
The minimum perimeter is at P' = 0, hence:
P' = 2 - 578/x² = 0
578/x² = 2
2x² = 578
x = 17 inches
y = 289 / x = 289 / 17 = 17 inches
Perimeter = 2(x + y) = 2(17 + 17) = 68
The minimum perimeter of the rectangle with an area of 289 square inches is 68 inches.
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