As shown in the figure, in the isosceles trapezoid ABCD, ab ∥ CD, CE ∥ Da, known AB = 8, DC = 5, Da = 6, calculate the perimeter of △ CEB
∵ ab ∥ DC, CE ∥ Da, ∵ quadrilateral AECD is parallelogram, ∵ Da = CE = 6, DC = AE = 5, ∵ DAB = ∵ CEB, ∵ EB = ab-ae = 8-5 = 3. Also ∵ quadrilateral ABCD is isosceles trapezoid,
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