Question

Solve the formula

S =4pi r^2

Answer 1

The answer is option A

Explanation:

S = 4πr²

First of all divide both sides by 4π

That's

`\frac{4\pi {r}^(2) }{4\pi} = (S)/(4\pi) \\ {r}^(2) = (S)/(4\pi)`

Find the square root of both sides in order to isolate r

That's

`\sqrt{ {r}^(2) } = \sqrt{ (S)/(4\pi) }`

We have the final answer as

`r = \sqrt{ (S)/(4\pi) }`

Hope this helps you