Theory:

A side length of the Rubik's cube is \(6 \ cm\). Calculate the lateral surface area and the total surface area of the Rubik's cube.
 
Marco Rubino   Shutterstock.com.jpg
 
Solution:
 
Edge (side) of a cube \(=\) \(6 \ cm\)
 
Lateral surface area \(=\) \(4a^2\)
 
\(=\) \(4 \times 6^2\)
 
\(=\) \(4 \times 36\)
 
\(=\) \(144\)
 
Lateral surface area of the Rubik's cube is \(144 \ cm^2\).
 
Total surface area \(=\) \(6a^2\)
 
\(=\) \(6 \times 6^2\)
 
\(=\) \(6 \times 36\)
 
\(=\) \(216\)
 
Total surface area of the Rubik's cube is \(216 \ cm^2\).
Reference:
https://www.shutterstock.com/image-photo/rome-circa-february-2013-example-successfully-1092574646 - Photography by Marco Rubino.