Question

The formula for the area of a circle is A= ar?m where A is the area and r is the radius. The subject of
the formula is A. Rearrange the formula to make r the subject.

Answer 1

Hi there! :)

Answer:

$\sqrt{\frac{A}{\pi } } = r$

Step-by-step explanation:

Formula for the area of a circle:

$A = \pi r^{2}$

Rearrange the equation in terms of "r":

Divide 'π' from both sides:

$\frac{A}{\pi } = r^{2}$

Take the square root of both sides:

$\sqrt{\frac{A}{\pi } } = r$

Answer 2

Answer:

$r = \sqrt{ \frac{A}{ \pi}}$

Step-by-step explanation:

$A =\pi r^2 \\Divide\: both \:sides\:of\:the\:equation \\\frac{A}{ \pi} =\frac{ \pi r^2}{ \pi} \\r^2 = \frac{A}{ \pi} \\\sqrt{r^2} =\sqrt{ \frac{A}{ \pi}} \\\\r = \sqrt{ \frac{A}{ \pi}}$