1 The intersection with C is the vertical line of ED, and the extension line intersecting with ED is at G. Since ABCD is a square, ∠ ADE = 45, ∠ CDG = 45. If the side length of a square is A, CG = (∠ 2/2) A and Ce = AC = (∠ 2) A, you can get ∠ ECG = 60 and ∠ ACE = 90-60 = 30 ∠ AEC =1/.

2 square ABCD∴BC = CD, BC//de ∴ CD = de ∴ BC = de ∴ quadrilateral BDEC is a parallelogram ∴BD = CE, BD//CE ∴ DBH = ∠ BHC.