Fold rectangle ABCD along AE so that point B falls on median line FG of right angled trapezoid AECD, and ab = root 5, then what is the length of AE? (trapezoid in rectangle) AE is trapezoidal bevel (waist)

Fold rectangle ABCD along AE so that point B falls on median line FG of right angled trapezoid AECD, and ab = root 5, then what is the length of AE? (trapezoid in rectangle) AE is trapezoidal bevel (waist)


In the triangle AB "F, AB" = AB = radical 5, FB "= (radical 5) / 2, AF = (radical 15) / 2 = EB is obtained according to Pythagorean theorem. Let be = x, then EF = x / 2. Triangle Abe area = AB * be / 2 = (radical 5) x / 2, triangle AB" e area = FB *