In △ ABC, ∠ C = 90 ° and the intersection line BC of AB is at D. if ∠ bad - ∠ DAC = 22.5 °, then the degree of ∠ B is______ .

In △ ABC, ∠ C = 90 ° and the intersection line BC of AB is at D. if ∠ bad - ∠ DAC = 22.5 °, then the degree of ∠ B is______ .


∵ De is the vertical bisector of AB, ∵ ad = BD, ∵ B = ∵ DAB, ∵ ACB = 90 °, and ∵ B + ∵ BAC = 90 °, which can be divided into two cases: ① as shown in Figure 1, ∵ B + ∵ BAC = 90 °, bad -