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Since the rectangular prism has an area of 52 square feet and two of the rectangles in the net are 4 ft. ร 3 ft., we can find the third measurement by dividing the total area by the product of the two known measurements:
52 sq. ft. รท (4 ft. ร 3 ft.) = 4.33 ft.
Therefore, the third measurement you need to know to have an area of 52 square feet is approximately 4.33 feet.