As shown in the figure, in trapezoidal ABCD, ad ‖ BC, ad = 3, ab = 5, BC = 9, the vertical bisector of CD intersects BC at e and connects De, then the perimeter of quadrilateral abed is equal to () A. 17B. 18C. 19D. 20

As shown in the figure, in trapezoidal ABCD, ad ‖ BC, ad = 3, ab = 5, BC = 9, the vertical bisector of CD intersects BC at e and connects De, then the perimeter of quadrilateral abed is equal to () A. 17B. 18C. 19D. 20

The vertical bisector of ∵ CD intersects BC at e, ∵ de = CE, ∵ ad = 3, ab = 5, BC = 9, ∵ the perimeter of quadrilateral abed is: ab + be + de + ad = AB + be + EC + ad = AB + BC + ad = 5 + 9 + 3 = 17