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Two oil pipes with circular cross-sections are subject to the constraint that the sum of their

diameters is 1m. By using careful reasoning find the diameters that give the maximum and

minimum possible combined cross-sectional areas. In each case give the combined crosssectional

area.

Which I am unsure of. I dont get how you can get a maximum and minimum of a circle diameter when the volume of material going through it is irrelevant.

Any assistance would be greatly appreciated.