Does the diagram define the area of cubes?

@JeremyECrawford Does the diagram attached accurately define the area of cubes (lack of third dimension aside)? pic.twitter.com/W1FCKpnRFz

— Dude Manguy (@SolarFlairPony) April 5, 2016

That is correct. "The cube's size is expressed as the length of each side" (PH, 204). #DnD https://t.co/gxddSbzSqp

— Jeremy Crawford (@JeremyECrawford) April 5, 2016