Example of cylinder area
Calculate the area of a cylinder with radius 3 cm and height 60 mm.
First, we must put both the radius and the height in the same units. So we have to change the height from millimeters to centimeters. If you want you can see our post on problems of conversion of measures of length that will help you refresh your memory to make the change of units.
60mm = 6cm
Now, we are going to calculate the area of the rectangle that is equal to the lateral surface of the cylinder. As we had already indicated its formula before, we substitute it for the values of the cylinder:
Area of the rectangle = 2 × π × r × h2 × 3.14 × 3 × 6 = 113.04 cm²
Next, we have to calculate the area of the bases, which is equal to the area of a base but by 2.
We take the formula that we had already indicated at the beginning and we also substitute the values:
Base area = 2 × π × r22 × 3.14 × 9 = 56.52 cm²
And to finish, we add the parts of the cylinder, that is, the lateral area that is the area of the rectangle and the area of the bases:
Cylinder area = 2 × π × r × h + 2 × π × r2113.04 + 56.52 = 169.56 cm²
Fernandez. C.(2021). Cilindro:
características, ejemplos y cómo calcular área y volumen. Recuperado de. https://www.smartick.es/blog/matematicas/geometria/cilindros/