Whichever segment it is to which you are referring, it does not need to be red; it can be any color.
The segment that intersects both foci is called the semi-major axis. The segment that is perpendicular to the semi-major axis with one end midway between the foci is called the semi-minor axis.
radius
21
24
26
4 11 10.8
radius
21
24
10
26
12
24
8
4 not 9..... ANSWER FOR APEX 10 (:
4 11 10.8
13
long