Odpowiedź:
v=400l=400dm³
V=4/3 πr³
r³=3V/π*4
r=∛3V/π*4
r=∛3*400/4π
r=4,57dm
P=4πr²
P=4π(4,57dm)²
P=262,62dm²
Odpowiedź:
P = 4πr²
[tex]V = \frac{4}{3}\pi r^{3}[/tex]
400 l = 400 dm³
[tex]400 = \frac{4}{3}\pi r^{3} \ \ \ \ \ | * \frac{3}{4}[/tex]
[tex]300 = \pi r^{3} \ \ \ \ \ | /\pi[/tex]
[tex]\frac{300}{\pi} = r^{3}[/tex]
[tex]r = \sqrt[3]{\frac{300}{\pi}} \ dm[/tex]
P = 4πr²
[tex]P = 4\pi * \sqrt[3]{\frac{300}{\pi}}^{2} = 4\pi* (\frac{300}{\pi})^\frac{2}{3} \ dm^{2}[/tex]
