What is the area of the figure below

   86 m²

Step-by-step explanation:

It can be convenient to think of the figure as an 8×12 rectangle with a 4×5 triangle cut off the corner.

The rectangle area is the product of its length and width:

  (12 m)×(8 m) = 96 m²

The triangle area is half the product of its base and height:

  (1/2)(4 m)(5 m) = 10 m²

Then the area of the figure is the difference of these:

  96 m² -10 m² = 86 m²