We are asked to calculate the surface area of the objects using the following formula

Where r is the radius, d is the diameter, and h is the height of the circular cylinder.
Part a)
The diameter (d) is 2.5 cm
The height (h) is 10 cm
The radius is half of the diameter

Let us substitute the given values into the formula

The surface area of the object is 88.36 cm^2
Part b)
The diameter (d) is 5 cm
The height (h) is 7 cm
The radius is half of the diameter

Let us substitute the given values into the formula

The surface area of the object is 149.23 cm^2