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December 20, 2014

December 20, 2014

Posted by **Alex** on Monday, July 18, 2011 at 1:58pm.

- Calc -
**Reiny**, Monday, July 18, 2011 at 2:15pmIf the radius is x, then the base of the rectangle is 2x

let the height of the rectangle be h

Perimeter = 30 = (1/2)(2πx) + 2h + 2x

30 = πx + 2h + 2x

h = (30 - πx - 2x)/2

Area = A = 2xh + (1/2)πx^2

= 2x(30 - πx - 2x)/2 + (1/2)πx^2

I will let you finish it ...

simplify a bit, then differentiate,

set the derivative equal to zero and solve for x

- Calc -
**Anonymous**, Sunday, April 29, 2012 at 10:57am63

- Calc -
**Anonymous**, Sunday, April 29, 2012 at 10:58am54

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