areal

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http://bildr.no/view/M2FSWng5

aner ikke hva jeg skal gjøre, hjelp?

[zell]

[tex]O(r) = 2h+2r+\pi r = 8.0 \ \Rightarrow \ h =4.0- r\left(1+\frac{\pi}{2}\right)[/tex]

[tex]A(r) = 2hr+\frac{1}{2}\pi r^2 = 8r-2r^2\left(1+\frac{\pi}{2}\right)+\frac{1}{2}\pi r^2[/tex]

[tex]A^\prime (r) = 8-4r\left(1+\frac{\pi}{2}\right)+\pi r = 0 \ \Rightarrow \ r = \frac{8}{4+\pi}[/tex]