The length of the major axis of the ellipse below is 17 and the length of the red line segment is 6. how long is the blue line segment?

In an ellipse, the length of the major axis is the total distance across the ellipse at its widest point. Given that the length of the major axis is 17, the semi-major axis is half of that, which is 8. If the red line segment (the semi-minor axis) is 6, then the blue line segment can be found using the relationship of these axes. The length of the blue line segment, representing the semi-minor axis, is thus 6.