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Distance between two points can be found using the Pythagorean Theorem.

First draw a coordinate plane, plot the points X and Y. Form the right triangle using gridlines. The measure of segment is the hypotenuse of the right triangle.

From Figure; \ \

The Pythagorean Theorem states that the square of the hypotenuse is the sum of the squares of the legs.

                      (Substitute ) \

                    (Evaluate powers )

                        (Add )

                            (Take the Square of root each side)

Distance between two points X and Y is 10 units.