How to use it
- Find Δx and Δy.
- Square, add, and square-root.
- Keep units.
See it in action
(1,2) to (4,6): √(3²+4²)=5.
How to verify it
Plotting shows a 3-4-5 right triangle.
Distance on the Coordinate Plane
The distance formula is the Pythagorean theorem applied to horizontal and vertical changes.