Question

A = 4πr2. can you help me solve for r

Answer 1

Welcome To OpenStudy

Answer 2

can you show your work so far?
if you haven't then how can you solve this

Answer 3

https://www.mathpapa.com/algebra-calculator.html

Answer 4

StarLord that is totally in accurate
he/she wants to solve for r

Answer 5

oh.... then
a=(4)(3.141593)r2
Step 1: Flip the equation.
12.566371r2=a
Step 2: Divide both sides by 12.566371.
12.566371r2
12.566371
=
a
12.566371
r2=0.079577a
Step 3: Take square root.
r=√0.079577a or r=−√0.079577a
Answer:
r=√0.079577a or r=−√0.079577a

Answer 6

We have no idea as to what `A` or `r` is so we would change this into an equation for r....we would keep `pi` as `the sign for it`....

\(\huge{A= 4 \pi r ^{2}}\) First we would divde by 4....

\(\huge{\frac{A}{4}=\frac{4}{4} \pi r ^{2} \rightarrow \frac{A}{4}= \pi r^{2}}\)

Next we would divde \(\Large{\pi}\)....

\(\huge{\frac{A}{4} \times \frac{\pi}{\pi} = \frac{\pi}{\pi}r^{2} \rightarrow \frac{A \pi}{4 \pi}=r^{2}}\)

Next we would do square root....

\(\huge\frac{\sqrt{A \pi}}{\sqrt{4 \pi}}=\sqrt{r^{2}}\rightarrow r = \frac{\sqrt{A \pi}}{2 \pi}\)

That would be your answer :)