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October 1, 2014

October 1, 2014

Posted by **jump** on Sunday, September 30, 2012 at 2:04pm.

- calc -
**Reiny**, Sunday, September 30, 2012 at 3:12pmI radius of semicircle is r, then the length of the rectangle is 2r

let the height of the rectangle be h

so 2r + 2h + (1/2)2πr = 10

2r+2h+πr=10

2h = 10 - 2r - πr

2 dh/dr = -2 - π

dh/dr = -1 - π/2

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