Answer:Step-by-step explanation:The area of the irregular rectangle is the sum of the areas of each of the rectangles that for the shape.
For the large rectangle, the area is:
A = 82 * 50
= 4100 sq. ft
The area of the smaller rectangle is:
A = 15 * (82 - 75)
= 105 sq. ft
The area of the shape is:
4100 + 105 = 4205 sq ft
Divideing this by 3, we have: 1401.7