Find the surface area of the sphere. a.

Step 1 ：The surface area of a sphere is given by the formula \(4\pi r^2\), where r is the radius of the sphere. However, the question does not provide the radius of the sphere. Therefore, we cannot proceed to calculate the surface area without this information.

Step 2 ：If we had the radius, we could simply substitute it into the formula and calculate the surface area. For example, if the radius was 5 units, the surface area would be \(4\pi(5)^2 = 100\pi\) square units.

Step 3 ：Without the radius of the sphere, we cannot calculate the surface area. If we had the radius, we could use the formula \(\boxed{4\pi r^2}\) to calculate the surface area.