In a parallelogram ABCD, a straight line AF passing through point a intersects point BC at point E, and a DC extension line intersects point F. try to explain that the area of △ ABF and △ ade is equal

In a parallelogram ABCD, a straight line AF passing through point a intersects point BC at point E, and a DC extension line intersects point F. try to explain that the area of △ ABF and △ ade is equal

It is proved that triangle ABF has the same base and height as parallelogram ABCD, so its area is half of parallelogram ABCD
Same: Triangle ade is the same as parallelogram ABCD, so its area is half of parallelogram ABCD
So the area of △ ABF is equal to that of △ ade