Let a triangle with the sides a, b, c be given with three vertex transversals that pass through a point. Show that if for each of the three vertex transversals, one forms the quotient of their upper section and the whole segment , then the sum of the three quotients has the constant value 2:

I am stuck on what is meant by the "upper section." Is it referring to the segment past the point on the side of the triangle that the transversal passes through?

I appreciate the help.