Namely: 80*70 divided by 2+30*50=4300.

The area of the whole graph minus the blank area.

The whole graph is a triangle: the base is110+30 =140 and the height is 70+50= 120.

The whole graphic area is: 140* 120 divided by 2=8400.

Blank area: (80+ 1 10)*50 divided by 2=4750.

Subtraction: 8400-4750=3650.

The two answers are different. I think the first half is wrong. See more clearly. The shade part below is not a parallelogram.