To find the surface area of the net, we need to find the area of each triangle and add them together.
First, calculate the area of the equilateral triangle in the middle:
Area = (base * height) / 2
Area = (16.2 * 14) / 2
Area = 113.4 m^2
Next, calculate the area of the two triangles on the sides:
Area = (base * height) / 2
Area = (16.2 * 14.5) / 2
Area = 117.45 m^2 (for each triangle)
Now, add the areas of all three triangles together:
Total surface area = 113.4 + 117.45 + 117.45
Total surface area = 348.3 m^2
Therefore, the surface area of the net given an equilateral triangle as the base is 348.3 m^2.