# 3D coordinates

We saw previously how to represent 2D vectors on the $$xy$$ plane.

Now, we will extend this to look at 3D vectors using the $$xyz$$ plane.

3D coordinates are used, for example, by air traffic controllers to find the location of a plane by its height as well as its grid reference.

The vector OP has initial point at the origin O (0, 0, 0) and terminal point at P (2, 3, 5). We can draw the vector OP as follows:

Remember that 3D coordinates take the form $$(x,y,z)$$