In the right angle trapezoid ABCD, BC ‖ ad, ab ⊥ ad, ∠ d = 45 °, the vertical bisector EF of oblique waist CD intersects ad at g, and the extension line of intersection Ba intersects F Practice question 17 on page 46 in eighth grade (next) class

In the right angle trapezoid ABCD, BC ‖ ad, ab ⊥ ad, ∠ d = 45 °, the vertical bisector EF of oblique waist CD intersects ad at g, and the extension line of intersection Ba intersects F Practice question 17 on page 46 in eighth grade (next) class

Connect CG because vertical bisection
Then CG = GD because the angle d = 45 degrees
Then angle EGC = 45 degrees = angle AGF because Ba is perpendicular to ad, then Ag = AF and ab = CG
Then AB + AF = Ag + GD