Question 545619
We have to assume the height.
The standard height is 3 feet.

volume of tub = pi*r^2*h

1000= pi*r^2*h
1000/(pi*h)=r^2
1000/(pi*3)=r^2

r= sqrt(1000/(3*pi))
r= 10.3 feet
..
if you increase height the diamter will decrease