5.3.1.4 Construction of secrets

Let the point \ (e \) - the middle of the rib \ (a_ {1} d_ {1} \) cube \ (a b c d a_ {1} b_ {1} c_ {1} d_ {1} \). Build the cross -section of the cube with a plane passing through a point \ (d \) perpendicular \ (C E \). Find the area of this section if the rib of the cube is 2.