Answer :
The area of shaded region is equal to area of rectange of length 6 in and width 5 in minus area of triangle with base 3 in and height 3 in.
Determine the area of shaded region.
[tex]\begin{gathered} A=6\cdot5-\frac{1}{2}\cdot3\cdot3 \\ =30-4.5 \\ =25.5 \end{gathered}[/tex]So area of shaded region is 25.5 in square.