the distance formula is equivalent to the pythagorean theorem if you are trying to find the distance between a point in the plane and the origin

Question

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Answer 1

The distance between points (x₁,y₁,z₁) and (x₂,y₂,z₂) in 3-d space is

 

d = √[(x₁ - x₂)² + (y₁ - y₂)² + (z₁ - z₂)²]

 

To find the distance from the origin, plug in the coordinates of the point in question for one triple, and plug in (0,0,0) for the other triple.