# What is the distance between #(13,-14,1)# and #(12,-21,6)#?

##### 1 Answer

May 14, 2016

#### Answer:

#### Explanation:

This is the coordinate system for 3-space. When it is broken down into projections onto the planes you end up with two triangles that are linked by a common side. Consequently we can turn to that good old favourite: Pythagoras.

Let the distance between points be