Question

Solve for the radius

Answer 1

To solve for the radius(r), you need to isolate/get the radius by itself in the equation:

`A=(1)/(2) \pi r^2` Multiply the inverse of 1/2, which is 2/1 or 2 on both sides

`(2)A=(2)(1)/(2) \pi r^2`

2A = πr² Divide π on both sides

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

`(2A)/(\pi ) =r^2` Now square root √ both sides to get "r" by itself

`\sqrt{(2A)/(\pi ) } =√(r^2)`

`\sqrt{(2A)/(\pi ) } =r` Your answer is A