Question

What is the distance formula for three dimensions?

Answer 1

`D=sqrt((P_(1_x)-P_(2_x))^2+(P_(1_y)-P_(2_y))^2+(P_(1_z)-P_(2_z))^2)`

Please see the following link for a full explanation and example:
What is the distance between `M(7,−1,5)` and the origin?