in this kind of exercises you need to work in 3 steps:
1. split your figure into shapes you know
2. calculate the area of those separate shapes
3. add the areas
1. (see picture)
2. shape 1 (triangle)
A= 8m×3m
A= 24m²
2. shape 2 (rectangle)
A= 8m×4m
A= 32m²
3.
total A= A1+ A2
A= 24m²+32m²
A= 56m²
