These are the steps:
1. Find area of the two triangles.
2. Find area of the rectangle.
3. Add them up.
Step 1: Find area of the two triangles:
Formula : Area of triangle = 1/2 x base x height
Both triangles are identical.
Height = 5m
Base = 6 + 6 + 12 = 24
Area = 1/2 x 24 x 5 = 60 m²
Step 2: Find the area of the rectangle:
Formula : Area = Length x Width
Area = 12 x 7 = 84 m²
Step 3: Find the total area:
60 + 84 = 144 m²
Answer: 144 m²