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

`r = \sqrt{ (A)/( \pi)}`

Explanation:

`A =\pi r^2 \\Divide\: both \:sides\:of\:the\:equation \\(A)/( \pi) =( \pi r^2)/( \pi) \\r^2 = (A)/( \pi) \\√(r^2) =\sqrt{ (A)/( \pi)} \\\\r = \sqrt{ (A)/( \pi)}`

Answer 2

Hi there! :)

Answer:

`\sqrt{(A)/(\pi ) } = r`

Explanation:

Formula for the area of a circle:

`A = \pi r^(2)`

Rearrange the equation in terms of "r":

Divide 'π' from both sides:

`(A)/(\pi ) = r^(2)`

Take the square root of both sides:

`\sqrt{(A)/(\pi ) } = r`