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Quick Plane Question

I have a whole bunch of similar questions to do, can someone please show me how to do this one step-by-step so I can do the rest?

Find the distance from the origin (0,0,0) to the plane ABC where A= (1,-1,0) B=(1,0,3) C=(3,1,3)

Thanks
Actually I think I've worked my way through it. I got 9/7, is this correct?
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DFranklin
18
Calculate N = (A-B) x (A-C) (vector product).

This gives you a vector normal to the plane.

The distance of the plane to the origin is then |N.A|/|N|

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