18.1 square inches.
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The maximum area with straight sides and a given perimeter is a square.The sides of the square are (68/4) = 17 inches.The area is (17 x 17) = 289 square inches
The area would be 17 X 17 = 289.
Perimeter of the square: 17+17+17+17 = 68 cm
Exactly as in the question its perimeter is 17 units of measurement
17. A 4x4 rectangle has a perimeter of 16 units and an area of 16 square units. A 3x6 rectangle has a perimeter of 18 units and an area of 18 square units. The number 17 is halfway between 16 and 18.