Psychology of Exceptional Child Practice Test

The surface area of a cube comes from its six identical square faces. If the edge length is s, each face has area s^2, and the total surface area is 6s^2. Here the material gives an edge length of 5.5, so the surface area is 6 × (5.5)^2 = 6 × 30.25 = 181.5 square units. That matches the value 181.50. The other options would require different edge lengths (for example, 91.25 would imply a smaller edge, and so on).