So you have to find one piece at a time.
Lets start on the left, we have a 4 by 5 triangle.
4×5=20
20÷2=10 units²
Next is the rectangle.
4×17=68 units²
Now the other triangle.
4×5=20
20÷2=10 units²
Now add it all up.
10+68+10=88 units²
Hope This Helps and God Bless!