Question

What is the distance between # (–2, 0, 1) `and`(–1, 4, –2) #?

Answer 1

The 3D grid forms a nice rectangular lattice so we can use the Pythagorean Theorem:

`d^2 =(-2 - -1)^2 + (0 - 4)^2 + (1 - -2)^2` or

`d = \sqrt{1+16+9}=sqrt{26}`