Answer:
190.8 square inches
Step-by-step explanation:
The area of one of its triangular sides is given by A = bh/2 were b = base = 9 inches and h = perpendicular height = 6.1 inches.
A = bh/2. Since we have 4 triangular sides, the total area of its sides A₁ = 4A = 4bh/2 = 2bh = 2 × 9 × 6.1 = 109.8 square inches.
The area of is base is the area of a square = 9² = 81 square inches.
So te total surface area is 109.8 square inches + 81 square inches = 190.8 square inches
