How to Calculate the Area of a Curved Surface

By Society & Culture & Entertainment Last updated Tuesday, January/07/2025

Surface Area of a Sphere

1). Square the radius. For example, if the radius is 5 inches, then:
5 inches * 5 inches = 25 inches squared.
2). Multiply Step 1 by pi.
Pi * 25 inches squared = 78.54 inches squared.
3). Multiply Step 2 by 4:
78.54 inches squared * 4 = 314.16 inches squared.

1). Square the radius. For example, if the radius is 2 inches, then:
2 inches * 2 inches = 4 inches squared.
2). Multiply Step 1 by 6.28.
6.28 * 4 inches = 25.04 inches.
3). Multiply the radius by the height. For example, a radius of 2 inches and a height of 10 inches would give you:
2 inches * 10 inches = 20 inches squared.
4). Multiply Step 3 by 6.28:
20 inches squared * 6.28 = 125.6 inches squared.
5). Add Step 2 and Step 4 together:
25.04 inches squared + 125.6 inches squared = 150.64 inches.