well ive got thatOAB is a triangle with OA = a and OB = b; C is the mid-point of OB, D is the mid-point of AB and E is the mid-point of OA; OD and AC intersect at F.
If AF = hAC and OF = kOD show that h = k = 2/3
AC = 1/2(b - a)
and
OD = (1/2)b - (1/2)a
AF = h/2(b - a)
and
OF = k((1/2)b - (1/2)a)
and this what i think i need to do get the intersection
h/2(b - a) = k((1/2)b - (1/2)a)
but i dont know where to go from there ?