As shown in the figure, quadrilateral ABCD and quadrilateral aefc are two rectangles, and point B is on the edge of EF. If the area of rectangle ABCD and rectangle aefc is S1 and S2 respectively, what is the size relationship?

As shown in the figure, quadrilateral ABCD and quadrilateral aefc are two rectangles, and point B is on the edge of EF. If the area of rectangle ABCD and rectangle aefc is S1 and S2 respectively, what is the size relationship?

S1=S2
The diagonal AC divides the rectangle ABCD into two congruent triangles
∴S△ABC=½S1
∵△ ABC is the same height as rectangular aefc
∴S△ABC=½S2
∴S1=S2