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13 October, 14:53

If the volume of a cylindrical block is equal to 800cm^3 prove that the total surface area is equal to 2 (pi) x^2 + (1600) / x, where x cm is the radius of the base. hence obtain the value x which makes the surface area a minimum

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  1. 13 October, 17:49
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    The area is a circle plus a cylinder, which can be thought of as a rectangle which has been rolled up.
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