This pyramid has 4 sides shaped like triangles and a square base.
The total surface area is the sum of the areas of the 4 triangular sides and the square base.
Each triangular side has 0.7 ft base and an 8-ft height.
The square base has side 0.7 ft.
Area of the sides:
area of a triangle = bh/2
area of 4 congruent triangles = 4 * bh/2 = 2bh = 2 * 0.7 ft * 8 ft = 11.2 ft^2
Area of the square base:
area of a square = s^2 = (0.7 ft)^2 = 0.49 ft^2
total surface area = 11.2 ft^2 + 0.49 ft^2 = 11.69 ft^2
Answer: A. 11.69 ft^2