P=4\pi R^2 \\\\ 4\pi R^2=400 \ |: 4\\\\ \pi R^2=100\\ R=\sqrt{\frac{100}{\pi}}=\frac{10}{\sqrt{\pi}} \\\\ V=\frac{4}{3} \pi R^3 \\\\ R=\frac{10\sqrt{\pi}}{\pi}
V=\frac{4}{3}\pi R^3 =4\pi R^2 \cdot \frac{R}{3}=P \cdot \frac{R}{3}=400 \cdot \frac{\frac{{10\sqrt{\pi}}}{\pi}}{3}=\frac{4000\sqrt{\pi}}{3\pi} \quad odpowiedź