Question

Consider a cylinder with radius 4.5 cm and a height of 12 cm. Describe how to calculate the surface area of the given cylinder and what the surface area means.

Answer 1

Surface area of a cylinder = 2πrh+2πrsquared
= 2x3.14x4.5x12+2x3.14x20.25
= 339.12+127.17
= 466.29
Therefore, the surface area of a cylinder is 466.29cm

Answer 2

To find the surface area of a cylinder you need to multiply its circumference by its height, plus the areas of the bases. So, multiply the circumference by the height and add the bases : (π4.5×2)12+(π4.5²×2)=466.52cm².
Surface is the area of the outside part of 3D figure.