It is known that the quadrilateral ABCD is a spatial quadrilateral, and e.f.g.h is a spatial quadrilateral AB.BC.CD . da What is the shape of a quadrilateral efgh 2 when AC = BD, the shape of efgh is 3 when AC ⊥ BD, the shape of the quadrilateral efgh is 4 when AC and BD satisfy, the quadrilateral efgh is a square

It is known that the quadrilateral ABCD is a spatial quadrilateral, and e.f.g.h is a spatial quadrilateral AB.BC.CD . da What is the shape of a quadrilateral efgh 2 when AC = BD, the shape of efgh is 3 when AC ⊥ BD, the shape of the quadrilateral efgh is 4 when AC and BD satisfy, the quadrilateral efgh is a square

1. The shape of efgh is parallelogram
2. When AC = BD, the shape of efgh is diamond
3. When AC ⊥ BD, the shape of quadrilateral efgh is rectangle
4. When AC and BD are vertical and equal, the quadrilateral efgh is a square