Question

A=4πr² despejar (r) si A= 6.28​

Answer 1

Explicación paso a paso:

$a = 4\pi {r}^{2 } \\ \frac{a}{4\pi} = {r}^{2} \\ r = \sqrt{ \frac{a}{4\pi} }$

$r = \sqrt{ \frac{6.28}{4\pi} } = 0.706927522 \\ {r}^{2} = 0.499746521 \\ a = 4\pi \times 0.499746521 = 6.28$

espero te sirva