Find the area of the figure.

For this case we have to:
Area of a rectangle[tex]: A_ {r} = a * b[/tex]
Where a and b are the sides of the rectangle
Area of a triangle: [tex]A_ {t} = \frac {b * h} {2}[/tex]
Where b is the base and h is the height of the triangle.
So:
[tex]A_ {r} = a * b\\A_ {r} = 8 * 13\\A_ {r} = 104 \ m ^ 2[/tex]
On the other hand:
[tex]A_ {t} = \frac {5 * 6} {2}\\A_ {t} = 15 \ m ^ 2[/tex]
Finally, the area of the shaded region is given by:
[tex]A_ {r} -A_ {t} = 104-15 = 89 \ m ^ 2[/tex]
ANswer:
[tex]89 \ m ^ 2[/tex]