Here, Area would be sum of both shapes.
Area of a Triangle = 1/2 * bh
Here, b = 38 - 5 = 33
h = 29 - 20 = 9
Substitute their values,
A1 = 1/2 * 33 * 9
A1 = 148.5
Area of the Rectangle = a*b
A2 = 20 * 38 = 760
Total Area = 760 + 148.5 = 908.5
In short, Your Answer would be 908.5 Feet²
Hope this helps!