Aleksandr has a roll of paper that is in the shape of a right circular cylinder. It has a height of 28 cm and a diameter of 15.5 cm. Help Aleksandr solve for the surface area. Use 3.14 for
the value of pi.
First, we need to find the radius of the cylinder. Since the diameter is 15.5 cm, the radius is half of that, which is 15.5/2 = 7.75 cm.
Next, we can calculate the surface area of the cylinder using the formula:
Surface Area = 2πr(r + h)
Substitute the values we have:
Surface Area = 2 * 3.14 * 7.75(7.75 + 28)
Surface Area = 2 * 3.14 * 7.75(35.75)
Surface Area = 2 * 3.14 * 271.625
Surface Area = 1704.011 cm²
Therefore, the surface area of Aleksandr's roll of paper is 1704.011 cm².