Answer:
144 m²
Step-by-step explanation:
From the diagram, we can see that the shape is made up of a square and 4 triangles. (We know it's a square as its width and length are equal).
First, find the area of the square.
Area of a square = width x length = 6 x 6 = 36 m²
All the triangles are the same, so we need to find the area of one of the triangles and multiply it by 4.
Area of a triangle = 1/2 x base x height = 1/2 x 6 x 9 = 27 m²
So the total area of all 4 triangles = 4 x 27 = 108 m²
Therefore the total surface area = 36 + 108 = 144 m²
