In the unit square grid as shown in the figure, △ ABC is shifted 3 units to the right to get △ a ′ B ′ C ′ (where the corresponding points of a, B and C are a ′, B ′, C ′), then the degree of ∠ BA ′ A is______ Degree

In the unit square grid as shown in the figure, △ ABC is shifted 3 units to the right to get △ a ′ B ′ C ′ (where the corresponding points of a, B and C are a ′, B ′, C ′), then the degree of ∠ BA ′ A is______ Degree

As shown in the figure, after translation, AA ′ = 3, while passing through point B, a vertical line is drawn to AA ′, and the vertical foot is D, ｜ BD = 4, a ′ d = 4, ｜ ∠ BA ′ a = 45 °

Given the points a (2a + 1,2), B (1, B-A), write the values of a and B of the following classes. (3) the point a is shifted 2 units to the right to get the point B: a =, B =; (4) a
The point B: a =, B =, is obtained by translating the point down 4 units;

Given the points a (2a + 1,2), B (1, B-A), write out the values of a, B that meet the conditions. (3) point a moves 2 units to the right to get point B: a =, B =; point a moves 2 units to the right, the abscissa is 2A + 3, the ordinate is 2, so B (2a + 3,2), so 2A + 3 = 1, B-A = 2, the solution is a = - 1, B = 1, (4) point a moves 4