Can anyone help me with this problem???

Question

A=4(pie)^2 for r

Answer 1

Area = pi r^2 ..... so replace A with that......(pi)r^2=4(pi)^2....
divide both sides by pi leaving r^2=4(pi)^2/pi...... leaving r^2=4(pi)...
now take sqrt of both sides.... r=2 sqrt (pi)

Answer 2

Do you mean 4^2(pie)?
4 would be the radius
If it is what you typed then 2 would be r

Answer 3

a = pi r squared

in your situation, r = two pi