Final answer:
The surface area of a sphere with a diameter of 40 inches is 1600 π square inches when leaving π as is.
Step-by-step explanation:
The surface area of a sphere can be calculated using the formula surface area = 4 π r², where r is the radius of the sphere. To find the radius from the diameter, we divide the diameter by 2. Given the diameter of the sphere is 40 inches, the radius would be 20 inches. Applying the formula:
surface area = 4 π (20 inches)² = 1600 π square inches.
Therefore, the surface area of the sphere is 1600 π square inches when the answer is left in terms of π.