An Arch Is a Semi-Ellipse 6 Meters Wide and 3 $\quad \frac { x ^ { 2 } } { 9 } + \frac { y ^ { 2 } } { 3 } = 1$

Multiple Choice

An arch is a semi-ellipse 6 meters wide and 3 meters high.Write the equation of the ellipse if the ellipse is centered at the origin.

A) $\quad \frac { x ^ { 2 } } { 9 } + \frac { y ^ { 2 } } { 3 } = 1$
B) $\frac { x ^ { 2 } } { 9 } + \frac { y ^ { 2 } } { 9 } = 1$
C) $\quad \frac { x ^ { 2 } } { 9 } - \frac { y ^ { 2 } } { 9 } = 1$
D) $\frac { x ^ { 2 } } { 3 } + \frac { y ^ { 2 } } { 6 } = 1$
E) none of these