A triangle plate is stacked together as shown in the figure, and the degree of ∠ a in the figure is calculated

∵∠BFC=∠BFE+∠α=90°,
∴∠α=∠BFC-∠BFE,
And ∵ ∠ FEA = ∠ B + ∠ BFE = 45 ° and ∠ B = 30 °,
∴∠BFE=45°-30°=15°
∴∠α=∠BFC-∠BFE=90°-15°=75°
A: the degree of ∠ a in the figure is 75 degrees

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