Answer:
x = 6
Step-by-step explanation:
(segment piece) x (segment piece) = (segment piece) x (segment piece)
2*x = 3*4
2x = 12
Divide each side by 2
2x/2 = 12/2
x = 6
An ellipse uses major axis and minor axis.
The major is the larger axis and the minor is the smallest.
Since this ellipse is wider than it is tall the horizontal red line would be the major axis.
The answer is B.