Hello there!
The correct answer is 20.
Hope This Helps You!
Good Luck :)
Given:
Height of cylinder = 12 cm
Diameter of cylinder = 6 cm
To find:
Surface area of the cylinder
Solution:
Radius = 6 ÷ 2 = 3 cm
Surface area formula:

Substitute the given values.


= 286.2 cm²
The surface area of the cylinder is 286.2 cm².
I’m pretty sure they all are real numbers-