Question 600881
A = pi*r^2


676pi = pi*r^2


676pi/pi = (pi*r^2)/pi


676 = r^2


r^2 = 676


r = sqrt(676)


r = 26



The radius is 26 cm. So the diameter is d = 2r = 2*26 = <font color="red">52 cm</font>