As shown in the figure, in the parallelogram ABCD, ab = 10, ad = 6, e is the midpoint of AD, take a point F on AB to make △ CBF ∽ CDE, then the length of AF is () A. 8.2B. 6.4C. 5D. 1.8

When bcdc = bfde, △ CBF ∽ CDE, ab = 10, ad = 6, e is the midpoint of AD, ∽ BC = 6, DC = 10, de = 3, ∽ 610 = BF3, the solution is BF = 1.8, ∽ AF = 10-1.8 = 8.2

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