Question

What is the distance between `(5,-11,-5)` and `(4,-13,6)`?

Answer 1

Let `A(5,-11,-5)` and `B(4,-13,6)`. We can now create the vector `AB(-1,-2,11)`. The distance between `A` and `B` is just the norm of the vector `AB`, which is `sqrt((-1)^2 +(-2)^2 + 11^2) = sqrt(126)`