As shown in the figure, in the triangle ABC, ∠ B = ∠ C, D is the point on BC, and FD ⊥ BC, de ⊥ AB, ∠ AFD = 140 °, can you find the degree of ⊥ EDF?
∵ DF ⊥ BC, de ⊥ AB, ∵ FDC = ∠ FDB = ∠ DEB = 90 °, and ∵ B = ∠ C, ∵ EDB = ∠ DFC, ∵ AFD = 140 °, and ∵ EDB = ∠ Dec = 40 °, and
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