A (r,h) = 2*r*h + \( \frac{r^2*π}{2} \) soll maximal werden
U (r,h) = 2*r + 2*h + r*π
2*r + 2*h + r*π= 20 h = \( \frac{20 - 2*r - r*π}{2} \)
A (r) = 2*r* \( \frac{20 - 2*r - r*π}{2} \) + \( \frac{r^2*π}{2} \)
A (r) = 20r - 2*r^2 - r^2*π + \( \frac{r^2*π}{2} \)
A (r) = 20r - 2*r^2 - \( \frac{r^2*π}{2} \)
A´ (r)=... A´ (r) =0 r= ... h = ... A (r,h) =...
mfG
Moliets