Question

A=1/2pie r squared solve for pie

Answer 1

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

multiply all sides by 2:

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

divide all sides by r:

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

therefore:

`{ \boxed{ \sf{\pi = (2A)/(r) }}}`