In rectangular ABCD, if f is the midpoint of AD and BF and AC intersect point G, the area ratio of triangular BGC to quadrilateral CGFD is

In rectangular ABCD, if f is the midpoint of AD and BF and AC intersect point G, the area ratio of triangular BGC to quadrilateral CGFD is

Let a ∵ ABCD be a rectangle ∥ ad ∥ bcad = BC ∥ AFG ∥ BCG ∫ AF / BC = Ag / GC ∵ f be the midpoint of ad ∵ AF = 1 / 2ad = 1 / 2BC, that is AF / BC = 1 / 2 ∥ Ag / GC = AF / BC = 1 / 2 ∥ GC / AC = 2 / 3 ∫ s ∫ ABC = 1 / 2S rectangle ABCD = 1 / 2As ∥ ABF = 1 / 4S rectangle ABCD = 1 / 4A ∥ s ∥ BGC / s ∥ ABC = 2