I, after being bored by sitting, decided to revise for my upcoming exams to end the 9th grade. I found an equation. This equation told me how to calculate the diagonal of a square. But there wasn't anything about how to find the diagonal (line connecting two furthest points) of a cube. So I decided to figure it out myself, and this is what I got: diagonal = side * sqrt 3 After comparing the result with the equation for a square (d = side * sqrt 2). I noticed a similiarity. If you think about it, the equation could be written as followed: diagonal = side * sqrt dimension of shape This also is true for dimensions 0 and 1 (in 0 dimension the answer is always 0 and in dimension 1 the diagonal = length of the side). So, my question is, does this work in the higher dimensions? I'm too lazy to think that much (at least for now) and I'll just hope someone else figures it out. Also, has this been discovered already?