Bis the midpoint of ac . ab=8v, and ac=2v +42. what is bc

When you answer this can you explain

The radius of the earth is two times the radius of the moon. what fraction of the volume of the earth is the volume of the moon?

On traditional maps, earth is represented in a flat plane, or by euclidean geometry. however, a globe is a more accurate model that comes from elliptical geometry.how does a globe represent the fact that there are no parallel lines in elliptical geometry? the equator is not parallel to any other latitudinal lines. the north and south poles are never connected by a geodesic. the geodesics connecting the north and south poles never intersect. the geodesics connecting the north and south poles intersect at both of the poles.