An engineer is designing a water tank that consists of a cylindrical part flanked by two hemispherical ends. If the total external surface area of the tank is to be 452 m 2 452\text{ m}^2 452 m 2 , what should be the radius r r of the tank to maximize its volume?

r = 113 π m r=\sqrt{\frac{113}{\pi}}\text{ m}

r = 226 π m r=\sqrt{\frac{226}{\pi}}\text{ m}

r = 113 2 π m r=\sqrt{\frac{113}{2\pi}}\text{ m}

r = 113 3 π m r=\sqrt{\frac{113}{3\pi}}\text{ m}

An engineer is designing a water tank that consists of a cylindri...

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