solve this using standard form of ellipse equation:
(x−h)^2/a^2+(y−k)^2/b^2=1.
Put the center of the ellipse at (0,0), then h=k=0, so that simplifies things. If the span is 112 feet, then the semi-major axis in the x direction is 56, that would be 'a'
I think you have to use the given information to solve for 'b.'
Getting 13.5488, so 13.5 or 13.55 feet seems fine as a rounded answer.
