The space quadrilateral ABCD is cut by a plane, e, F, G and H are respectively on AC, CB, BD and DA, and the section efgh is rectangular
Efgh is a rectangle
HE//GF
GF / / ACD
GF//CD
CD / / planar efgh
Efgh is a rectangle
HE//GF
GF / / ACD
GF//CD
CD / / planar efgh