What is the area of the shaded part of the figure?

The area of the shaded part of the figure is .

The area of the rectangle is:

8 × 18 = 144 cm^{2 }

^{ }The area of the shaded part is half the rectangle

So the area of the shaded part of the figure is:

144 ÷ 2 = 72 cm^{2}