Question

What is the approximate surface area of a cylinder with a radius of 3 inches and a height of 10 inches?

1. 30in^2

2. 87in^2

3. 217in^2

4. 245in^2

Answer 1

245in^2

Curved surface = 2pi x r x h = 2 x 3.1 x 3 x 10 = 186
2 ends = 2 x (Pi x r x r) = 2 x 3.1 x 3 x 3 = 55.8
Total area = 186 + 55.8 = 242in^2 approximately