Answer: 204cm²
Explanation:
I assume you are trying to work out the area of the shaded section as you have not provided a question?
1. To get the area of the whole rectangle we do length x width.
12 x 20 = 240.
2. To get the area of the triangle we do base x height, ÷ 2.
9 x 8 = 72
72 ÷ 2 = 36
3. Then to get the area of the shaded section we do the area of the rectangle - the area of the triangle
240 - 36 = 204