If a pair of triangular plates are stacked together as shown in the figure, then the degree of ∠α is______ Degree

If a pair of triangular plates are stacked together as shown in the figure, then the degree of ∠α is______ Degree

According to the particularity of angle of triangle plate, it can be known that ∠ AEB = 45 °, ∠ B = 60 °, ∵ ∠ α is the outer angle of △ BDE, ∵ α = ∠ AEB + ∠ B = 45 ° + 60 ° = 105 °. So the answer is: 105